You do understand "If I can't mock people, what joy is there left in the world?" could make you look like an asshole, right?
Just telling the truth in a low key softball way where we can all laugh, and of course you're laughing right along with me.
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?
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Mockery can be cruel, and even gentle mocking can be irritating or even harmful if it's very repetitious. Mockery is not always appropriate, or even truly funny. Mocking others is not an especially important activity or an especially important form of humor.
Even so, categorical prohibitions of mockery (in society, in particular workplaces, whatever) are truly and obviously joyless propositions. Maybe they're warranted in some contexts! But to say 'there can be no mockery' is indeed inherently stifling.