1) There is a sexism problem in tech. I have seen it first hand.
2) It's not present in all companies all of the time, and gender balance is not evidence, in and of itself, of the problem existing in a given workforce.
3) Sexism is not unique to the tech industry. My wife is a qualified helicopter pilot, and was told (in 2008!) "sure, send in your resume, but I should warn you that we run an unofficial no-chicks policy" by one outfit she applied to as a junior pilot.
4) The issues about which you're complaining - bullying, harassment, restraint of trade etc. - are not in any way related to either sexism or the tech industry. It's about power. Groups who have in the past been marginalised and oppressed are now becoming powerful, and are abusing that power in exactly the same way as their erstwhile oppressors. It's seen as okay by them and their supporters, because it's targeted at 'bad people'. I used to work for a University nearly two decades ago, and saw the same pattern play out there in fields unrelated to tech. It's just taken a while to get rolling in our industry.
As Rand once said: "every infringement of human rights has begun with the suppression of a given right's least attractive practitioners". Mencius Moldbug is the example who springs to mind here.