I have to say, based on my own experience, you will always find a degree of discrimination, when you practice a hobby that's largely dominated by a different group of people.
I'm also a soapmaker, among several other hobbies, and, as that, I'm a member of about 1/2 dozen or so soapmaking forums, all of which are absolutely dominated by women. I have never been frontally dismissed because I'm a man, but I have felt many times I wasn't being taken seriously, probably because of that.
But then again, life is discrimination. I've been discriminated because I was young (and couldn't possibly know what I was talking about), poor, Latin, Argentinian (not necessarily by Americans), "short" (at 5'10"), etc. Now I'm being discriminated because I'm "old" (at 46).
Then again, instead of complaining, or fighting, about it, my method of choice is to make the discriminator look like an idiot. One of my favorite hobbies (that I haven't been able to practice since I came to the US) is R/C car racing. One day, at the track, I saw another guy setting up his car wrong, so I went up to him and told him so, privately, so as not to embarrass him. He became agitated, and told me: "when you have 20 years experience in this hobby, you can talk to me". So I didn't talk to him anymore. I just lapped him 3 times in the race. First time he lost a race in months.
Now, there's a lot less discrimination in this forum than in most others I know, but it does exist. Don't get me wrong, most everybody here are great people, always willing to help, and I'm very happy to have found them, and the mods do a great job at keeping things under control, without turning the forum into a virtual jailhouse, but every now and then, you do see a post that doesn't belong.
For example, some time ago, there was a thread complaining about people not using their turn signals when driving. As that is something that really pisses me off (but then again, most everything does

), I was reading the thread, with the intention to reply to it, when I saw somebody had posted a reply saying, more or less "turn signals became optional since the driving test is bilingual". Very elegant, but, if that's not racism, I don't know what is. So I decided not to reply to that thread, even when I do agree that, in an English speaking country, the driving test should be taken in English.
About the Internet being blind...well, it is, to a point. I knew Yooper was a woman, way before joining. I don't remember why, but something in one of her posts tipped me off. Of course, it wasn't difficult to figure that the OP is a woman either...
Personally, I don't care. There are 2 kinds of people, in this forum, and everywhere else: those I respect, and those I don't. I couldn't care less if you're a man, a woman, or a little green thing with an eye in your forefront.