This is exactly that kind of comment that show that internet is sexist ... Of course it's for the lol but come on. We are better than that.
About the OP message : I don't think Larian was sexist by choosing this name, it's just that most language use the male as the "default" gender. Yeah yeah I know, it's sexist, but we can't change thousand year of language evolution in a pinch.
In fact my best Warrior is Madora - you have to give credit to Larian that they did use a female character as the though guy in the game.
So the skill name is certainly not a sexist choice, but more a generic name. Sure they could have named that something else, but I'm pretty sure they discarded other name for this one ...
But nothing about Expert Marksman