I once was a total jerk on a mailing list (okay in my youth I was a jerk many times on mailing lists).

Someone shared an article I had seen earlier that year. “Why would you share this? This is old news it’s already made the rounds on the web.” Like I expected everyone to have the same experience as me. Luckily someone told me to chill out or I’d be blocked, that the list was for any news people found interesting. I felt very embarrassed and didn’t post there again for a long time, but it was my own fault.