First off I want to say it's ok to. Why not? I'm straight. It's like a redneck telling redneck jokes.
I'm staring a new movement. You know those PSAs that tell you not to say something is "gay"if it is dumb or bad. Which is a good thing. People should not be doing that. Especially Matt and Trey.
Well I thought why not say something is "straight"? "Your shirt is so straight." "My parents are not letting me go out tonight they are so straight." Of course the word would still be used in other contexts. So own it and use it.