What is it about Men in tech which makes them so uniquely offensive to women unlike men in other fields to the point women avoid the field?
There doesn't have to be anything which makes them uniquely offensive. This is, however, a website which concentrates on technology, so understandably they are going to write articles which discuss the problem in technology rather than in other fields. If this was a website which focussed on teaching you would find articles worrying about the bias towards women in the profession and the dangers of that and how to positively discriminate towards men.
Bias in technology matters a lot, however: we all spend increasing amounts of our time using systems built and maintained by technology companies, and if the people who build those systems are biased against or in favour of certain groups then the systems they build probably will be, too. If Facebook, for instance, was controlled by people who thought having sex with goats was OK, we'd worry, wouldn't we? Well, it's not, but it may be controlled by people who have other biases, and that's worrying as well.
I suspect that, in fact, gender bias in technology is particularly severe. We know for instance that the number of female CS graduates has fallen by approximately a factor of two since 1985, so something is actively driving them away, and that thing started happening in the mid 1980s. This hasn't happened, for instance, in physics, where the rate of female physics graduates rose steadily from 1985 to the mid 2000s before falling back a little (however the rate of female graduates was lower than in CS for most of this time). I'm not going to speculate on what the thing is that is driving women away from CS.