one should ask if they find themselves
being treated badly
by a group
of people, especially a community
that seems to be friendly
toward each other. Why? Because usually people don't go out of their way
just to treat someone badly
Now, we know there are some groups that do things like this. However, it's usually a fanatical group going after someone totally opposed to those views. For example, it's probably not a black person's fault that the KKK is after them, and it's probably not a homosexual's fault that reactionary bible-thumpers are out to get them.
But any group that's not at an extreme will either be open and friendly, or at least tolerant of others and willing to treat them civilly. So if they're not, you should try and figure out if it's something you did. Are you insulting them without reason? Are you treating them badly unless they agree with you? Are you acting as a fanatic? Is their treatment of you simply a reflection of your treatment of them?
When you go around kicking people, don't get upset when some of them start kicking back. Unless you're insane, of course.