i finally managed to read all 62 pages of this tread and decided to make a tl:dr of the people against parsers:

People will be mean to me because my damage is low.

its toxic to not accept someone because their a liability and we should all carry them even if its a farming party.

you don't need a parser to improve. you just gotta be amazing at the and read a guide and then run something perfectly.

the introduction of parser will not improve the communities skill level.

theorycrafters find everything out with simulations and ability descriptions.

FFlogs is toxic

japan's mentality is different and so yoshi-p wont introduce official parsers to avoid potential toxicity (the only legit argument i can remember reading in this tread)

people say WoW is toxic, WoW allowed parsing that means parsing brings toxicity

they shouldn't put parsing because raiders are elitist and will abuse it.

and my favorite parcers=the devil (you would think people would think a bit more about what they say after experiencing HW)

I was on the fence about parsers at the beginning thinking it could possibly lead to more toxicity. But reading trough this tread made me realize that SE should stop coddling us, because it seems the most toxic people are the non parsers living in there bubble