This will be true, yes. For the most part. However, if you do go to a magic convention and you take you and your magic seriously, there will be no shortage of magicians willing to help and discuss magic with you without rest until the convention ends. You might have to sort through some lonely magician types for sure, but it's not everyone and people will take you seriously as a female entertainer/magician.
I might be biased living here in San Diego, but I think Magic-con is one of the best 'conventions' I've ever been to, simply because Syd and the Buck Twins stay very true to their goal of having a magic 'conference' instead of a 'convention'. The speakers are always walking and relaxing around the lobby during the breaks, and are always very approachable. It's a very safe learning environment for people of all skill levels.