What I didn't want to wake up to

So...last night in a feminist thread in a forum (which I was debating responding to in the first place because my feminist experience is intertwined with PoC experience, is intertwined with my LGBT experience, and wasn't entirely sure how to enter the conversation because I wasn't sure how my responses might be taken, since I can't talk about my feminist experience without the other two. Anyway the thread itself fairly superficial thus far), I had made the comment that I am not entirely comfortable right now calling men feminists (pro-feminist, supporters of feminism, yes) because they benefit from the system (I'm not saying that you have to agree with me, it's just my personal...belief, right now) and I got the response:

I guess I disagree that they are benefiting from the system, so it's easier for me to include them. I feel the same way about racism.

And...I'm not entirely sure how to respond to that. I mean, my first thought was "Well, clearly you're not a PoC", (well, and white people don't benefit from institutional racism? Really?) but figured that wasn't the way to respond. I think that...they see sexism and racism as things that are generally overt, rather than covert. I don't want to veer the thread into a different direction, and turn it into a wankfest, but on the other hand I can't really leave that comment alone.