Lemmy is the tolerance paradox in action.
If you want societaly disenfranchised people to have a voice, you need to silence those who can use their voice to silence them.
You can also use the nazi bar story to explain why there are no conservatives on lemmy. I know not all conservatives are nazis but there you have the bad apples phenomenon to counter. Just a little mysoginism, sexism, racism, is already too much.