Lots of RTFM and refusing to answer direct technical questions because "why would you want to do that?"
Some channels, like #politics on efnet were true cesspools.
In contrast, my later experience with FreeNode has been consistently helpful on virtually every channel I've been to, except for #paludis, which really was full of jerks. I've seen trolls maybe once every year or two on FreeNode and they've been swiftly dealt with, rarely to be seen again.
I guess your mileage will vary depending on which channels and networks you visit, though.
Internet was a fun place when enthusiasts had their own websites written in cgi/perl/asp back in the day, and sharing was caring.
I think this is why people praise ham radio community because it never went mainstream. Pick any sport that is niche, it is similar.