Can this quote be a metaphor " the big kids call me mercury cause i'm the swiftest thing in the neighborhood"

Yes, because you are comparing two things

I guess so, because you are comparing two things without like or as. It is not the best one I have seen though. No offense

There is nothing inherently wrong with being gay. speaking generally, opposition to gays are usually judged on people's moral basis whether it be religion, experience or other factors. to conclude, there is no objective answer to this question only subjective ones that rely on people's idea of what is right and wrong.