Pretty much the entire human race is subconsciously insecure AF, so they overcompensate by being judgemental of others whenever they can get away with it - which is why it happens so much more on the Internet where there are almost never IRL repercussions for their behavior. Being offended gives people an excuse to feel better than someone else for just a moment. It’s very much like a drug addict - they get a momentary high from feeling superior, but “high” lasts less and less every time so they have to do it more and more.

Considering the stress so many are under with the state of the world today, the insecurities & associated need to overcompensate are very high. Since people are addicted to social media for their self-righteousness “fix” (where they can get it and get away with the behavior it drives), and the tech bros make shit-ton of money from being the “pusher”, it’s not gonna stop unless some law is passed to decrease the addictive “features” and/or people figure out how to “detox” themselves.