Black, White, and Colour

We all know at least one person who goes around calling everything gay. Gay this, gay that. It's especially irritating when the situation or object in question doesn't even have a gender. Seatbelt stuck? Gay. Locker won't open? Gay. And those famous ones that have about zero relation to being gay. The school is holding a history contest? Gay.
Whether you go along with it or are repulsed by it, everybody knows what "gay" means in this context. In some situations, the word is correctly used to describe a person or activity that is regarded as homosexual. But due to over-usage by some moron, who gave it international popularity, the word is often misused and carries a different meaning, which could be summed up in a few words: ridiculous, stupid, useless, wrong, and dumb. We all know what those people are trying to say. But society needs another word, this is getting old. Don't you think it's a tiny bit offensive to actual gay people if we describe everything we don't like or think is stupid as gay?
I sometimes wonder what the world will be like after gay marriage is legalized. Yes, I said "when", not "if", because by the looks of it - New York legalization, thousands of parades - it's guaranteed to happen. A hundred years ago, a conversation between a black man and a white woman was unthinkable, let alone a marriage between the two. Now, interracial marriages are as common as those of the same race. Though personally, I cannot fully support or stand against gay marriage because I don't know what it's like to be gay. If I loved someone and wanted to marry them, I would go to any length to make that possible, no matter what society says. But I'm not sure how natural it really is. With this, there can be countless arguments for both sides. One that I find powerful is that homosexuality is found in over 1,500 animal species. Ironically, it is very uncommon that individual animals continue to exclude heterosexual activities and seek same-sex partners. Homosexual behaviour can be found fairly easily throughout the animal kingdom but homosexual orientation is rare - simply speaking, they are one-night stands. But does this apply to the human race?
Being Christian, I should believe that being gay is a sin. I don't, same as I don't believe premarital sex is a sin. But Jesus said, "Love your neighbor as yourself." (Mark 12:36). He didn't say "unless they're gay", did he now. Honestly, here are so many contradictions and things that don't make sense in the Bible that the way I see it, the wisest thing to do it not to follow blindly, but to use your own brain and judge for yourself, because you were given the ability to think, not trail behind your master's cloak like a dog.
The American and Canadian schooling systems are also filled with contradictions. From an early age, educators beat into children's heads that "being gay is okay". However, when it comes to legalizing gay marriage (since it's fine, right?), some of them suddenly flare up and start protesting, saying how gay couples are destroying the traditional concept of marriage and family, how other children will be influenced by kids who have same-sex parents, and so on.
It all comes back to a simple question - are people born gay or do they choose to be gay? If being sexually attracted to the same gender is in-born, it could be compared to being born a certain race, couldn't it? No one can change their skin colour, and no one can change their sexual orientation.