Well isn't this sub a good example? OP comes to a left leaning space, creates a community where 90% of the content is about how "the left" or "them" are crazy and dumb. Get's mad and offended when people don't share his views. Starts a new sub where only opinions he likes are allowed.
The mindset of someone going out of their way to go somewhere or see something that they know will offend them, then lashing out and saying that thing or person shouldn’t be offending them is ridiculous. Just the thought of something existing that they don’t agree with infuriates so many people.
This is in every political, social, racial, ethnic, sexual, etc group, too.