How many warnings do they need? MJF has mocked a disabled fan, ruined someone's drawing, thrown a fan's phone, asked if it was "too late to abort" a young girl, spat in someone's coffee, thrown someone's hat, gave a kid the finger, and now stole someone's drink and threw it on a child. Most of these were picked up by the wrestling media so it isn't like MJF and AEW don't know how this stuff is perceived even if there's a vocal group that defends anything he does as being a "good heel". I guess him usually targetting children and the infirm whilst knowing most adult fans are marks these days lowers the risk of him being punched out, plus there's the whole "fan touching a wrestler means the fan can be mercilessly beaten by security and half the roster" thing.
It's approaching "middle of Fifth Avenue..." territory with some people.
(I would have included him motor boating that one fan but I guess it's consensual even if it's a risky thing to do these days)
The old "I was merely pretending to be retarded" excuse hasn't cut it for over a decade now. What MJF does is he involves people - often minors - from outside the performance and makes them part of it in a derogatory manner without their consent. This isn't jawing back at a gobby fan nor is it a pantomime where the story is self contained and the villain vanquished.
If you want a comparison it's like those trashy YouTube prank channels everyone abhors, except they're almost always set-ups because they'd get sued. So really it's more like those even dimmer morons that try to be prank channels but are too lazy to set it up properly.