I also find that a lot of people with strong opinions on who is or who is not gay, also seem to be blinded to the possibility of a character being bisexual. We like to put things into simple categories, but the fact of the matter is sexuality is a spectrum, and a person can sit anywhere along that spectrum between straight and gay. So it is short sighted to be so absolute about these characters.
Or blinded to the fact that despite having some personality traits that might suggest homosexuality does not in fact mean a person is actually homosexual or even bisexual. I say this based on that most of my life people tend to think I'm gay, but I'm not., nor am I bisexual. The fact that I strongly support LGBT rights despite being straight myself also confuses a lot of people.