As an old hand in ICT it wasn't always like this. Something happened (in my opinion) between about 84 and 94 which systematically eroded and undermined women's experience in ICT.
I'd say it was gamer/pc culture but it's beyond that, although it's tied up in it. The conference cycles and tradeshows also played a role. Booth babes played a part, trivialising women's roles in public.
Several dozen highly significant design, analysis and operational roles in the internet vested in women back "then". People sometimes forget that. Women have always been a part of systems, networks, code. Always.