Hubski is FAR less sexist than most sites. That comes with the intelligent discussion and the lack of short, witty, pun-filled comments. The easiest jokes to make (like the ones that populate the top comments on sites like reddit) are the ones that make shallow jokes that sacrifice respect towards gender, sexual preference, race, religion etc.

I can mostly speak to reddit but there are two types of people who piss me the fuck off and reiterate the "the internet is sexist" impression. First, the short comments by people who probably aren't actually hateful but want attention and the people who actually have crazy fucked up opinions about certain groups. While enlightening to observe, I still stand by my GTFO -> go to the 1800's mofo.