People think of the worst possible version of the thing they're reading about.

"I want healing to be more interesting" == "I want every job to have the old MNK rotation"
"Tanks shouldn't hold people hostage for 15+ minutes while they solo a boss if the people who died just want to try and learn it" == "if you try to kill a boss at 5% to get the clear as a solo tank you're subhuman sludge who deserves to eat dirt and I hate you you're not supposed to have feelings or opinions you are my AGGRO SLAVE"
"Maybe more normal content should have enrages" == "I want ultimate level DPS checks in ARR leveling dungeons I am an elitist who hates all these scrub idiot baby players who can't git gud"

Something like that, at least that's what it always feels like