The thing I always loved about IRC was that even when I was 12 years old, people took me seriously, not because I was male, or white, or an adult, but because I was thoughtful and intelligent - age in this case being the key differentiating factor.
Disgusting sexist people exist. If you tell them your gender they may well attack you for it, because they are terrible people. What are we debating here? The only assertion I've made is that IRC is inherently gender neutral by definition.