The biology argument is central and right on. Imagine people saying walking on hands is "equal" to walking on legs and suing everything in site to make accomodations - and forcing kids to accept "arm walking equality" . That would be abusive. Kids also know boys kissing each other is wierd. Making them accept it is also psychologically abusive. Of course lots of faux studies show up in media trying to suggest homosexual parents are even better than normal but all such studies fail to stand up to scrutiny. Indeed "homophobia" itself is a contorted term since it implies a mental disorder that would be involuntary.
A Really Important Psychology Study Used Faked Data
http://nymag.com/scienceofus/2015/05/really-important-psych-study-used-faked-data.html
I think all kissing is weird, frankly. I never liked mouth to mouth tongue kissing either sex. Maybe it's psychological brainwashing against kissing men, or maybe I just think it's gross. Now, a harmless, closed mouth peck on the lips is acceptable for any sex.
And I also think muff diving is gross, and plenty of straight (and gay) people also must agree with me, so because of biology, does that mean anti-muffdivers are all really gay? What a ridiculous argument you are making. And even grown men kiss other male relatives all the time. If you kiss your son goodnight, that's considered weird? So tell us the truth, do you get aroused when you see 2 men kiss? Because for me, mouth to mouth kissing does nothing for me at all.
Also, you pointed out a mental disorder like homophobia would be involuntary and not voluntary? How so? Because I never thought that. I figured that being a hateful bigot was usually completely voluntary.
Meanwhile, there's the fact that most of the compendium of psychological and psychiatric books out there are usually nothing more than author driven fluff pieces with various generalized observations about human conditions and various random opinions attached (and even heavily religiously biased opinions masquerading as science at that). So all these variously biased psychology books and even all the biased psych studies should be taken with a healthy dose of skepticism. And also don't forget that the scientist or doctor promoting a psych agenda, such as a gay one, will inevitably try to confirm whatever he thinks is right, which is an already flawed and biased perspective from the start. And the vast majority of junk science out there about homosexuality is being heavily funded by the religious right and even the feds (no surprises there), and the bias goes so far as infecting entire religious universities which receive the federal funding to do these gay junk science studies, and all to save baby Jesus from the evil gays.