I remember about 20 years ago going into a famous homebrew store in Ohio. I was with my dad. I was completely and totally ignored by 3 different clerks, while all of them asked my dad if he needed help. Maybe he looked lost, because he was, but I was there to get a new pH meter. I couldn't find them, so finally I went up to the counter and asked. They were pretty dismissive of me.
Several years later, I went into a new store in Wisconsin. I was walking through the store, looking for a hydrometer. A man stopped me by the kits, and said, "hey little lady- would you like to make a nice fruit beer kit?" I kid you not. I said, "Actually no. I'm looking for something specific for my all-electric HERMS 1/2 barrel system. Sorry. Wrong store". (The store has long since closed)
Times have changed! There are many female brewers out there, and I've been treated so well over the years by brewery owners, brewers both pro and homebrew, and even the AHA Governing Committee is mostly made up of females. It's great to see that we are respected as capable brewers. I know the GC has a diversity committee, and it would be great to see more ethnic groups and races in the hobby as well.
I don't know as many pro female brewers as males, but I'm happy to see that it's becoming less uncommon.