That's what most people normally do, yes. Then many people out there define an "ability to enjoy hetero sex" as a "normal human experience" and therefore see gayness as a disability that needs a cure.

I'm not arguing about the conclusion here, but about the method and the basis for deriving this conclusion.

The initial comment in this thread declared deafness to be an "actual defect" while gayness "is just people being inherently gay". Such division is completely arbitrary and doesn't follow from any law of nature. Only from current societal views which change a lot with time.