It's not a lie or hearsay. I've been playing WoW quite a bit lately as filler until Stormblood comes out. Mass vote-kick fests are very common. Hell I just last week I had to turn down 2 vote-kicks on every trash pull before Krosus. The WoW community is toxic as all get out. Parsers are certainly not the cause you see tons toxic behavior that has nothing to do with parsers. Racism in trade chat, using terms for social disabilities as insults, petty rage quits in Mythic+. However in casual public settings parsers are used as tools by those toxic elements and offer relatively little benefit to the average person just looking to get their loot.
