It's no different than my neighbors, who are so concerned with everything my family does, and has complained to the county tax office over a dozen times crying that I'm not paying enough in taxes. They also got mad when I put up a three rail white PVC fence around my horse pasture. They thought I had placed it on their land. Had to get a surveyor to come out and survey the line. The idiot came out of his house and argued with surveyor (found out my neighbor had built his driveway with half of it on my land). They call animal control anytime one of my animal gets close to their land (including the horses in my own dang pasture / they don't like the poop smell).
My point? Misery loves company. Some people don't understand the meaning of "All men are created equal." And because of that, they feel that they are better than some, and by some omnipotent anointment, have the duty and right to decry against others having the same rights as they. It's been that way all through history. Slavery, women's suffrage and even begrudging others success and wanting to tax them down to their level. Yup, even the Liberal's are guilty of it, too.
The only potentially reasonable position against gay's would be on a religious basis. That however doesn't give a person the right to discriminate against gays.
Hell, I told my wife a few years back that I had made a profound discovery about myself. We were in Key West walking near the man made beach and walked up on three young ladies in... well... you know. For some reason, my legs wouldn't work, and my wife kept pulling on my arm until they did. After walking a little further, I turned to my wife, and declared that I was most definitely a Lesbian. Thank God she laughed.
As long as what a person does, doesn't harm or impede upon me, anyone else, or our rights as a citizen, then they can have at it.