Can't combat it without specifics due to how large and inclusive the term "game industry" is.
Sure you can. That is not the actual problem here. You can:
1) Not act sexist yourself.
2) Call out others who are acting sexist when you see it.
3) Make it clear to everyone, even those who are not being sexist right now, that it is not okay to act sexist and make the workplace a terrible place to be for women, or for any other minority for that matter.
You don't need to know who in the industry is being sexist at this particular moment to do things that combat sexism in the industry as a whole. I may be one person, just a programmer lost in a sea of faces in the game industry, but I can still take the stand that no matter who I work for, what I build, or why, I refuse to knowingly perpetuate sexism in my workplace. If sexism or bigotry of any sort in my world survives, it will not be because of me.
The problem is that not enough people take that stand.
I don't think Anita is faking nor lying, but the more I look the more I wonder if all the things Anita is saying are actually her opinions or McIntosh's opinions and she is just the public figure presented for the cameras.
What you're basically saying here is, "I don't think Anita is faking, but I wonder if she's faking?"
I do question if she is truly critiquing games to bring about change or if this is her study she claimed she wanted to do about online harassment.
Without fully understanding what it is exactly that you're referring to, there are two possibilities I see.
If this isn't a study of online harassment and is in fact critiquing games to bring about change, then I think what she's doing is a good idea.
If this IS a study of online harassment, given that I think online harassment is a phenomenon that needs to be recognized and studied, then I think what she's doing is also a good idea.
If you agree that both of these things are good ideas, and one (or even both) are happening, then why bring up this point at all?