The entire infantile humour / brogrammer / hipster / drama phenomenon. It started in Ruby (_why, Zed Shaw, GitHub, etc) then moved into JS as Node and CoffeeScript became popular with Rails users, now it's in Rust (again via Ruby).
I don't think it's always the same people or that it has anything to do with Ruby itself, it just seems like there's a certain culture that first grew in the Ruby / Rails community.