What is the exact problem with someone saying "One of the reasons I attend hackathons is to hit on chicks"? Is it the phrasing or the concept itself? Would it be more acceptable to say "One of the reasons I attend hackathons is to meet interesting and attractive women", or is the idea itself the problem? I can definitely imagine someone objecting to being described as "a chick" instead of "a woman". However, I don't…
Really, turning it into a gender/oppression/whatever issue obscures the problem -- other attendees are present for a well-known purpose, and you're there not just for some other purpose (which wouldn't necessarily be that big a deal, ex. sponsors/recruiters) but to interfere with their achieving that purpose.