To me the problem seems to the racism and shittalking that you have attached to all your examples, not the tbagging itself. I totally agree, harassment has no place in any game.

Part of having fun in a competitive (as in pvp) experience is goading and being goaded, that's what creates memorable experiences. Friendly rivalry can be very rewarding. They got one over on you this time, and took a risk to celebrate it, next round you can take a risk to target them, and maybe celebrate as well.

I don't really mind it if the enemy team is joking around and just being playful about it, but some people are clearly out to just put people down and I don't think they should be the priority;

So why not go after the problematic behaviour directly rather than the behaviour that is sometimes playful.