You are not obligated to do anything. If, however, you believe groups that use 100% of the available sapients will always outcompete groups that use 50% of them you will probably, of your own conscience, gravitate towards those groups that do not tacitly exclude those 50% and avoid those that do. When one side tacitly approves of rape threats and murder threats for people who speak out they make it pretty darn easy for me to choose.
A professional tech conference shouldn't have a code of conduct banning sex talk which, by the way, is completely irrelevant to technology? Just because you, as a woman, don't have a problem with it then no other woman is allowed to have a problem with it? Nice. Hey ladies, mamoswined ain't faded. Sexism is OVER.