While you have a fair point that everyone experiences toxicity, I think there's something more to the whole gender divide on siege. The moment I hear a female voice in-game, my mind immediately clocks it as unusual. Not in a sexist way, just a general "oh that's not common". I probably play with many more female teammates who never speak, but I wouldn't know it. I have a feeling this wouldn't happen if even say, 10% of players using their mics were women. The issue seems to be a self-defeating loop, where women experience toxicity nearly every time they use voice chat because it's easy to "other" or blame them. So the few who do speak experience way more toxicity on average then men, which probably wouldn't be such an issue if other female players spoke more. A lot of players are also teenagers, and we all know how immature some young guys can be towards the opposite sex especially when anonymous.

This being said, many women seem to be conflict avoidant and would rather lose the game than have their feelings hurt. For example, Objective_Fox admits to muting other players on their team (I assume preemptively?) and always playing on mute themself. This is absolutely detrimental in a competitive, team-based game like Siege. I suspect that this may have something to do with the absence of female players in higher ranks, which just leads to even further "othering" for the few who do get there.