The M+ community is a mixed bag of mature pleasant people, that even if they do a few mistakes, its a pleasure for a tank to play with, and sometimes it’s full of toxic people that start shouting random toxic garbage, the moment things don’t go “their way, in their own head”.
It’s great with pleasant people, you get to do a few more keys with them and get some of the 10X weekly runs for the vault done. You stay in contact or whatnot in hopes you get to play with them again to avoid negative experience.
However, when it comes to toxic people, the first hint of toxicity, whatever it is, I ask all tanks not to continue the key. Usually these people start shouting stuff even if its about moving a pack of mobs 1 inch from their AOE to avoid stuff on ground, but they usually like to “keep it quiet till the end” to show you “the wrath of their toxic immaturity” and shout out all the toxicity they want, despite having ++ timed the key you ran.
Since Blizzard won’t penalize toxic behavior in pugs, its up to us TANKS to do it: Any hint of toxicity, whatever it is, comment, complain, remark, "not going their way’, Stop what you are doing and leave the key. Really, there is a huge lack of pug tanks out there, if we, the remaining tanks, start doing this, you will see how FAST Toxic behavior will change. We have the most impact in the M+ pug keys, if we start to leave keys, the toxic community will have no choice but to change their behavior.
Think about it, replying back to these toxic people will do nothing useful, if you want to make an impact on their behavior, you need something to stick with them, and leaving keys repeatedly is the best way to do it. Imagine that you are playing with adults that haven’t grown outside of schoolkid immaturity, there is no point reasoning with these people, you need to punish them to make them understand.