The only men that I've personally known that classify themselves as a witch have a transgender type of issue. I'm not making a judgement call - this is just what I've seen. I'm sure there are others that identify as a witch that don't. I just haven't met any.
I'm certainly not transgender and I consider myself a witch. I do have an atypical sexuality but I certainly identify as the gender I was born as. The main reason I use the term "witch" to describe myself is because I use witchery/witchcraft/sorcery/magic and if this were the 17th century you can most certainly bet that if discovered I would have been tried for witchcraft. Who/what practices witchcraft? Plenty of men were persecuted and executed for it in history.
I really don't understand the gender issue here. Is this supposed to be some sort of personal "paradigm" for people? The use of the word "witch" is only subject to be used to describe females? In reality I think overall this is kind of a silly discussion, albeit an interesting one. Are people here actually bothered by the fact that there are men who refer to themselves as witches? It's only a word, and in our (mostly) Germanic language there isn't any particular gendering of nouns like in the Romantic languages.
Nor do I understand why the context of Lilith is being used as a focal point. There are plenty of members here on this very forum that don't even use those (sets) of mythology as a reference.
@Pikkusisko I have an interesting pdf file somewhere that talks about the way that Seiðr was possibly equated with a type of sexual magic that was mostly attributed to females because of phallic wands they would use. I will have to dig in my old computer but if I can find it I'll send it over to you. What is actually interesting about this though is that homosexuality itself wasn't necessarily looked down upon by the old Norse and there are stories about men fighting for the right to sleep with great warriors, or perhaps it was a certain god in the pantheon, I don't specifically remember.