I was on vacation last week .. I really don’t do well in crowds of 20 - hundreds.

I had a few times a day when I was just around some rude people that were just idiots and just getting into my personal space. I have ptsd so my space always needs protected for me to be okay and functional.

If I were you in that coffee shop I would have likely left after the second rudeness. Or at least move to another table. What I do find more relaxing is coffee shop in a book store , I think the vast majority of people in a book store are just much nicer as to true readers a book shop is a magical happy place.

Sorry that happened to you