That's a failure of your team lead. Tough code reviews are important, but I don't tolerate people being petty or nasty. We actually train new employees on how we like to do reviews.

If I see people being given the benefit of the doubt, I call out other senior engineers. If I see people ganging up on a new person, I do the same.

A quote I've always heard, is generally when someone talks about how "brutally honest" they are, they enjoy the brutality more than the honesty. I filter for the latter, and come down hard on the former.