An update, had a couple come by today.
I'd find it very hard to take a guy serious that brings his bitch with him to see a foxbody mustang.
You should have set the price at $3100, let buyers take you down to $2500 and been done with it.
You also need to be aggressive in your ad, similar to what has been suggested by others here, give off the attitude that you don't want your time wasted, say things like "if you thing you are getting the car for $2000, don't bother contacting me".
A well written ad brings the people you want to the car and keeps the idiots away. If you sound like you're mature and know what you are talking about people like this couple you describe wouldn't contact you.
Also to give the car some more curb appeal repaint the window trim black, sorry to say it, it looks horrible painted to begin with, even worse in orange.