A statement of fact is not an appeal to emotion. Being able to put yourself in another's mind, for a moment, is a skill that depends on certain anatomical constructs of the brain being in-tact and fully-functional. The functioning of this system is a
gradient, and not simply on or off. Since a heterosexual male has no experience of having been attracted to a male in the same intense way he's attracted to females, it's probably very hard to relate, and to the extent that they think
all minds think just like theirs (in the extreme case, this might be evidence of autistic tendency), they might simply not believe homosexuality is a genuine phenomenon, i.e. "they're just lying." I can understand such people.
e.g.:
Mirror neuron - Wikipedia, the free encyclopedia
Second, feeling that something is
wrong is quite different from saying it
doesn't interest me.
Wrong seems to imply some kind of universal wisdom, and at worst, the adherence to a conditioned and irrational revulsion.