Without knowing why he objects, I don't know if he's being sexist or just stupid. Same as Sarkeesian.
I think Sarkeesian's point is something to the effect that there are too many games with male protagonists and some balance is needed. Or something. I don't claim to be able to read her mind, this is just a guess. Assuming that is her reasoning, I don't think it's sexist. I don't agree with it, either, but for reasons independent of sexism.