Earlier quoted context omitted.
The marketing material assumed that the people reading it would be heterosexual men, and gave no consideration to the idea that a woman might actually want to attend an event. Finding women attractive is not a sin. Assuming the whole world should revolve around what you find attractive without giving any consideration to the other half of the world's population is sexist. Not "I hate women" sexist. Just "women don't…
Tech population =! world population. To not recognize that the tech population is dominated by men is to put your head in the sand. I like to code, I like to look at scantily clad women, and I fully believe they're just as equal as men. EDIT: Downvote away. You don't have to believe in fact for it to exist.
To not recognize that advertising tech events that female programmers do not feel comfortable attending because they do not want to be treated like subservient beer-wenches is partially responsible for the continued decline of women in the tech industry is to put your head in the sand.
That's what people are taking issue with here. No one is putting you on trial for liking to look at scantily clad women. Trying to make yourself into some kind of martyr for "finding women attractive" movement misses the point so thoroughly as to defy belief.