People can be gay if they want because it's a free country. Hating on consenting adults for what they do with each other in their personal lives is such a waste of time. More to the point, it's not practical or worthwhile to get up in arms over it because people have been having gay sex since well before classical antiquity. Greek guys had sex with hot young men on the side and Sappho was probably fugging the young women she taught, so it's not like the past was a morally superior place to where we are now. On the contrary, being more open about sex is healthier than repressing it like religious fundamentalists have done and still do only for those innate desires to emerge in weirder, more unhinged ways (IE, Catholic priests molesting kids because of clerical chastity, Wahhabists fucking camels because Wahhabism says sex is ev, southern evangelist preachers secretly being gay or conducting affairs, etc). Human beings are sexual creatures and saying sex and homosexuality is sinful isn't going to change that.
Also, I realize OP is being facetious, but I'd be hard-pressed to call that line homophobic. I guess it's mildly insensitive in a "using gay as an insult" sort of way, but that's setting a pretty low bar for outrage. I mean, was that really an expression of genuine malice towards gay people by Sam Raimi and Toby Maguire? I'd be more concerned about genuinely hateful fanatics like the vice president and Lindsay Graham who want to make dominion theology a reality and set up sinner reeducation camps.