I notice this especially with my Norwegian learning. People are rude, call me names, or make fun of me on Reddit for using the wrong word or “en” vs “et” or using a direct translation because I don’t know how they say it in Norwegian, like saying somethng like «Ingen av bedriften din!» instead of «Dette er ikke din sak» (according to the casual version of Bing Translate) whereas a Norwegian-speaking Fediverse member would just say something like “You’re doing good, but it’s actually _____.”
People tend to be assholes. The more people in one place, the lower the chance of nobody being an asshole, and it does usually only take one. Then you add the karma system, which causes people to perform for the internet points. It’s not just people being a natural asshole for any number of reasons: people also reward the wrong things such as asshole behavior, Redditsplaining, zingers and stupid cringeworthy clichés. The karma factor is lower here, but still a thing.