Mikkayla started it by telling Tahan to shut up, which Tahan then told her to shut up because no one likes the sound of her voice, and then Mikkayla screamed 'well nobody likes you!' So they are both in the wrong, a lot of booze seems to be involved and I can see why Tahan did the skit about her eating.
Did Tahan take it to far? Most likely yes.
Does Mikkayla need to learn that if you dish it you are going to cop it? Most likely yes.
Hopefully we get to see the full argument at one stage because it was clear there was things missing from what we saw. And for all those that are going to jump on me about 'fat shaming' Mikkayla, don't. She brags about how much she eats and then complains about her weight. It would be hard to not say anything about it when she is doing that. My husband and I think Mikkayla is the second most beautiful girl in the house, but her behaviour towards other people is making her look ugly, not her body shape.