If you are interested in assessing this through some idealized, absolutist lens, it is totally sexist and discriminatory against men. If you are interested in pragmatic solutions that help genuinely reduce the sexist drama in the world, this model has a track record of success.
So you need to pick one. Do you want to double down on abstract ideals? Or are you interested in what works?
Women who are interested in the latter can potentially find benefit in seeking out a sisterhood and turning a deaf ear to the accusations of "reverse sexism" that inevitably get leveled, typically by people who have no constructive alternative to offer and who aren't actually interested in being supportive and inclusive of women.
But lookup discriminate and it has a few meanings. One of which refers to prejudicial or unfair treatment. That is the definition implied when referring sexist discrimination.
Every major dictionary specifically uses terms like "prejudice", "discrimination against", "stereotype". There is obviously a consensus that it is referring to negative/unequal treatment.
If some women feel that way anyway, are you suggesting that making more people feel that way helps or makes it not sexist?
Tech pushes many people out, male and female. Even if the men in tech are the same, what about the men who would like to be in tech but were pushed out? Or are all men the same?
I'd wager most men "pushed out" of tech weren't fleeing sexism and gender-based isolation. This whole thing seems like looking at a team of 10 -- nine men and one woman -- and, when the woman says, "Gee, it'd be nice to have another woman to talk to," responding by saying "Well how about you just talk to us nine guys instead? Wouldn't that be just as good?"
Should we also end racial violence by increasing racial violence?
Problem: Women feel they don't have anyone to talk to about their experiences as a woman in tech.
Solution: Increase their access to people they can talk to about their experiences as a woman in tech. Like, say, an online community.