jack - //I find it more difficult to comprehend why so many straight/non-crossing men feel so threatened/discomfited by those who do. //
As a gay woman, I would not dream of presuming to educate you in the mind sets of heterosexual men, I am sure you encounter them quite enough in your life (You just haven't met the right man darlin' ... and that's me! and all that nonsense!) but the fear of homosexuality is driven into a lot of boys and young men by their fearful fathers, a self-perpetuating stereotype we should really be losing by now as a society.
The irony is, when groups of men loudly grunt about 'backs to the wall ...' and similar Neanderthal comments, are almost universally the ones whose bodies would be guaranteed safe from interest by any gay man within a thousand miles of them.
Gay men have more taste, pride, self-respect, and absence of desperation that would be needed to consider the average homophobe as anything but a temporary speed bump in the road!