How about this one:
If you're like me, you have acquaintances who sometimes are okay, and sometimes act like jerks, to such an extent that you're not really sure if you could consider them to be friends. You're just not sure if you could count on them to support you.
But every once in a while someone comes along who makes it very obvious that they dislike you. They tell you in no uncertain terms that they are working against you.
It's been suggested that we should/could be grateful that these people are honest about where the relationship stands.