Ok, let's break it down again. You can be a bigot and not want to date a transgender person, or a person of the same sex, on that basis. For example, you can be a homophobic man, who is actually homosexual, and refuse to date men, despite being attracted to them, because you hate gay people (including yourself for being gay). Conversely, you can be completely devoid of bigotry and just not find certain traits attractive. So for example, I do think it is possible to lack any and all racism and not find white people attractive. Some people just love the way tan skin looks, or dark skin. And the opposite is true as well. No bigotry required.
Having a filter doesn't necessarily mean that you think it's impossible to get a match that is outside of that filter either. It doesn't necessarily mean "I could never be with someone who isn't inside this filter". It can just mean that you perceive that the chances are so low that you don't want to spend time on it.