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Fair, but trying to enforce "you're never allowed to mock people, even when those people expect enjoy it and it's all in good fun" also makes you an asshole. Different behaviors are appropriate for different groups. I have groups I swear in, and ones I avoid it in. Same thing.
How do you know whether the people being mocked genuinely enjoy it or the culture requires them to appear like they enjoy it?
The same way you know whether it's ok to talk about someone's family life, or politics, or anything else; you get to know them.