It's changing the definition of the word, so yes there is something to stand for. If you don't believe marriage needs defending, look at the rates of marriage. Now the meaning of marriage has been diluted so much, no one wants to get married anymore - there's no point except to possibly get benefits from the state.

I could have just as easily said people who use the term "homophobic" automatically lose the argument, as there's no fear involved. This is a battle of semantics - and if we want a quality debate then we need to keep definitions consistent.