As someone who played WoW for 8 years and raided heroic and then mythic for 4 of those years the idea that parsers lead directly to toxicity is utterly ridiculous. Were there instances of people using recount or skada to point out low dps and thus ridicule players? Yes, absolutely. However it was and is not common. I can probably count the amount of times toxicity was generated from one of those tools on one hand.

What is FAR more common is players being held ACCOUNTABLE for their mistakes. Are they interrupting spells? Attacking the right adds? Taking damage from avoidable AoEs? Maintaining a certain acceptable degree of dps to meet checks? That is what players were always removed for in my experience. I'm sorry but I simply don't feel there is a strong enough correlation between toxicity and the presence of a parser to warrant their absence.