The front line of the gender war is the American courtroom, where men are subject to grossly unjust and discriminatory divorce and custody law.
The custody issue is clearly a result of gender stereotypes. I'm a feminism in part because it's the one movement that's actively and effectively fighting against that root cause.
I don't think tech sexism in SV is _the_ frontline, or that the courts are _the_ frontline, but they're both important fights. (SV might be the frontline _in tech_, but not in gender or sex equality overall, or even in the US.)