Sure, things like that have occurred. They occur in many fields. The Linux kernel mailing lists could make your eyes water at times :-)

Things like "the [whatever] community is toxic-at-best" or "I don't relish the notion of [whatever] culture" are opinions that in Ruby's case are based on the behavior of a minority. It's like if people say all C developers are "fat bearded men." Quite a few are, but it's an unhelpful generalization.

If the Ruby community had a general atmosphere or a policy of encouraging sexist or unprofessional behavior, I'd let these remarks slide. But it doesn't. The articles and rants that make it to HN are usually the controversial parts because that's more likely to get votes on social voting sites like HN, alas.