(A) You are abusing the word toxic. Toxic can be defined as : actions that would land you jail time for harassment if you did it in real life.
Leaving a party because you dont want to be there anymore (RL equivalent of leaving a dungeon) does not constitute as “toxic”.
Harassing the ladies with inappropriate names would be the RL equivalent of being “toxic”.
What you wanted to say is “trolling”. That is the word you are looking for.
(B) Punishing leavers is a dumb idea. Here is why :