Redefining the phrase "be yourself"

I have always heard the phrase "be yourself", especially in the context of dating. Being a 30 year old single virgin has made me wonder what exactly this means, because it seems like my real self is quite off-putting. In the past, I have noticed that I have tried to be agreeable and pretend that my opinions were more "mainstream".

Lately, I have tried to regain my self-esteem and boost my confidence by a lot. However, now I get accused of being overly outspoken, abrasive, rude, abrupt, etc. due to my natural self being brutally honest. I do not mince words when it comes to my opinions, and often my opinions are allegedly very controversial and out of the mainstream. Being myself, I usually just blurt them out regardless of whether people like them or not.

A few examples:

-I am amongst people who make six figures or are millionaires or even richer during a meetup. I state that privatisation and private enterprise should be abolished. People call me a poor lower-class bum and/or a peasant. I tell them that they are full of ***** and are greedy b*stards. People brand me as "rude".

-Despite being American, I lived in the UK during my time at university. I support Lexit, which is supporting Brexit, but due to a left-wing argument rather than a right-wing one. I support Tony Benn and Jeremy Corbyn instead of right-wing/centrist Labour leaders like Blair, Brown and Miliband. People berate me for being poor and/or call me stupid. I tell them that capitalism has failed people like me. Verbal argument ensues.

-I plan to join Bernie Sanders' campaign. People in meetups make fun of me for being poor and not having enough money. Some tell me that they would rather pay 0% taxes and see me suffer, rather than paying more in taxes like most civilised Western countries do. I tell them that they are vile, greedy excuses for human beings. Verbal argument ensues.

-Woman asks me why I have had no relationship nor sexual history, no girlfriends, etc. I say that it just has not happened, not my fault. She makes fun of me and calls me a virgin loser. I tell her that she is scum who has no empathy nor understanding.

-My mother is a socialist, and one of my grandfathers was a Maoist from China. No explanation required as to why people here hate when I reveal this.

-I believe that religion should be abolished. No explanation required for this one either.

As you can see, I am very brutally honest and frank, especially when people insult me. This is "being myself". Yet somehow, people like me even less, the more I act "myself". So what exactly is this advice about "be yourself"? I refuse to be a carbon copy of what society asks me to be, so I am acting exactly how I feel that my true character is. But it just seems to fail as well.

I love your posts because they are thought provoking--this one in particular.
I think there is a difference between being yourself and provoking a fight. Is the meetup a networking mixer or is there a theme for it? The purpose of the group might dictate the tone one would take at that meetup. If the purpose is to make business contacts, you might not necessarily want to talk about things that would cause friction and thus defeat the purpose of the group or or your being there.
You know the old phrase about how politics and religion can very easy polarize people. I think its because these subjects are so complicated that people can take an opposing stance and both people can be right in some way and still wrong in others. Socialism and capitalism are both good in some instances and bad in others, I think. How which system effects you personally or people overall depends on the person and what parts of that system we are talking about. The Sanders campaign sounds wonderful for you. whether socialism could work in such a large, diverse country as the US with a history such as ours is a big question.These are very sweeping subjects and topics within them usually involve tons of history. They are also very emotional subjects, especially religion, because one must make a leap of faith for belief and they involve concepts that we are very passionate about.
I myself wish that things were so black and white that one system or one religion had all the answers. How simple that would be! One of the reasons I am proud to be an American is that we TRY to be tolerant of various ideas and various cultures. No, sadly, that is not always true as you have discovered.
Being yourself might mean talking about your interests or hobbies, what you do, your ambitions, etc.
Regarding someone calling you a loser because you havent dated etc, that seems so bizarre and unusual to me. Usually people have some reason to expend the energy to be hostile. You have described the San Francisco dating scene as being abrupt and cold. Maybe its that. As if these people are so rushed to find the dream date that they cant even be civil. Phew. To me, many people are potential friends, not just potential dates or life partners. Hey, lets go for a coffee, etc.I dont get that kind of attitude at all. However, life in some really big cities is definitely "life in the fast lane". Glad you are planning to move.
I just realized that one thing a man might not be thinking about is that, tho science has extended this window, women have a biological clock in that their childbearing years are limited. Food for thought, I hope.
well, hope this helps a little.

There's a difference between expressing an opinion and being rude and name calling. You call people greedy bastards and vile excuses for human beings. How can you expect anything good to come from that? I would also avoid bringing up politics and religion at a casual meeting where you are just getting to know someone. Obviously, if you want to build a more serious relationship, you will bring up your personal opinions, but I think there is a way to do it without insulting others.