Sadly, I've found very often that these people struggle with the notion that this is okay. Where the opposite choice gets so privileged, many act like they don't have permission to really be who they are. Being a fat admirer myself, I'm always frustrated by the lack of self-respect from many Fat Admirers. Even ones who are open about it seem to believe on a basic level that they don't actually have a right to their sexuality. That fat is fundamentally wrong. They may get to a place where they want to act on their sexuality, but they have no pride in themselves and provide no support to the political needs of the people they are attracted to.
I don't really know what to do about that because it feels so foreign to me. That political empathy developed in me almost immediately upon recognizing the physical attraction. As a kid, I didn't exactly have access to fat porn or the myriad of substitutes thin admirers take for granted, but what I did have access to was literature about fat acceptance and I read it voraciously. Politics and sexuality always went hand in hand for me, so in a lot of ways I don't know how to relate to fat admirers who act like they don't have a right to their sexuality. Like giving up their sexual desires is an inevitability.
Its okay to be attracted to fat people. Sadly, that can be a very important message, too. You don't have an obligation to consent to fat hatred. I get feeling like that's your only option, but its not. Its not shallow to be attracted to fat people. That's such a bizarre sentiment yet I see it so often from apologetic fat admirers. They'll date thin people as some sort of hairshirt to prove their virtue but its just such nonsense. Its accommodating thin privilege instead of challenging it. Its ignoring the ways fat people are denied attraction and instead creating a new instance of such.
Like I said, I don't have any easy answer to this, but I want to implore my fellow fat admirers to be proud of who they are and to know they have options beyond having their sexuality steamrolled by fat negativity.