When you tie your worth to your appearance, you are obligated to maintain that worth by ensuring that those of "lesser" appearance remain devalued. Those who could be allies and support become enemies.
When your self-worth depends on attracting men--and lots of them, what happens when you stop attracting them? Also, will you be able to remain faithful in a monogamous relationship if you constantly crave attention from multiple men?
Here's a (not so) secret: Fat acceptance proponents aren't seeking to force all men to find us attractive. Or any men. We ARE trying to keep those who do find us attractive (yes, folks, they do exist) from being shamed and ridiculed. Tell me, why DO you care so much what your buddy's girlfriend looks like anyway? Leave him alone, and let him be happy. Maybe you can't imagine being attracted to that person, but that doesn't matter. His preferences aren't your issue; your friends don't have to date people that you are attracted to. Hell, they're better off NOT doing so, for that matter.
It surprises me when haters go "Neener neener good luck having someone be interested in you, like I have got!" I'm married, you know. I was fat when we got married, and fat when we first met. I am very happy with him, and he is happy with me. I have no reason to attract "all men in the world" because I only care about one man being interested in me--and I've got him. He didn't have to be "forced" to love me, or clubbed over the head, or drugged, or anything; he was naturally attracted to me, and we happened to be compatible in other ways as well.
If anything, the fatophobes would seek to force him to NOT be attracted to me, because it upsets them to know that there's more to it than being thin.