"They" don't have an "IRC". #openbsd on Freenode/Libera is an unofficial venue. The channel isn't endorsed by the project or the foundation. In some moments you run into friendly people, and in other moments you run into angry people. It's not an OpenBSD thing. As someone who has been a regular in #openbsd for some 20 years I will assure that it's mostly friendly and helpful.
So, a random person on #openbsd once said you to RTFM and you are still salty a few years after? My (also anecdotal) experience with the openbsd community is very positive, so here's that.