I try to be accepting of everyone. This doesn't mean I'm accepting of everything everyone does.
Not every behavior is OK. There are lines in the sand I can't cross, and that when crossed by others, I can't support.
If someone continues to make crossing one of those lines an integral part of who they are, I can't keep accepting them. It's why I admit there can be no such thing as a "good cop", for example. There are some "jobs" which require-- as a condition of employment-- the crossing of those lines. Some "jobs" require archation. That's never OK.
There are also people who simply refuse to see that the line exists, and they'll cross it without noticing. Just because they are doing what they want, and no one else matters to them. They have no regard for the rights of others when respecting those rights would be an inconvenience.
I'm sure you know people like that.
I've never been perfect, and I never will be. But I do the best I can. Part of that is being civil to anyone who is making the slightest effort to live among others without being a thug or an overt parasite.
Yet, this makes me an extremist? I doubt I'll ever understand why this seems to be such a controversial, radical stance to some people.