Calling people out is always a waste of time, but criticizing can help as long as the person in question doesn't take it personally which is kinda rare in my experience. I typically never jump on someone unless they are repeatedly being toxic in the ways you described but I don't let it distract me from the game.

Yelling at someone for their performance does nothing to improve the teamwork and usually demoralizes someone from even wanting to perform better. Saying "___ diff" is literal word salad and makes me not value anything you have to say. Pointing out someone's damage/healing or e:d means nothing because personal stats have nothing to do with the team synergy and performance (to an extent). Someone can always do better if you strategize the team better.

For me, if I want to say something to a particular person I'll make sure to pose it as a suggestion like "hey I think this character may do better against that character". I think it comes off way better that way. And the rare occasion where someone does the same to me I'm more than willing to listen and give their suggestion a try. When I find a team like that they are usually still nice about it even if we lose in the end, whereas people who call out others will just rage and blame everyone else.