Clip-ons and bars can be changed so easily that it wouldn't make sense for it to be the only deciding factor. Another difference is also the rpm of the motor, and it's "tuning", for instance, the "crotch rockets" tend to rev to what,.. 15+ K rpm? (I don't think I've ever looked),
Then the Bandits, and the Hornets, while still using the engines of the Gixxer and the CBR (Fireblade), are typically detuned engines. They make less HP, and less torque, BUT, they tend to make it lower. The engines are not as high strung, making them more pleasant and manageable to ride. Then of course there's the seating position. More upright, and feet more underneath you, than up and back. A nice easily controllable position. (An excellent position for learning to ride a bike too.)
They also tend toward slightly more naked looks, concentrating on more "Tank and Engine" styling.
As for the Camaro/Firebird/Mustang being a sportscar, in the traditional sense, IMNSHO, I don't think it is. It's a pony car, not firmly in the high price, high performance, no back seat category that the corvette, Porsche or the exotics live in. More like a reasonable facsimile for the "rest of us". That's not to say that they can't be played with and made to run as fast as the "true" sports cars, in fact, I think that was part of the appeal of them. People expect(ed) to buy them and mod the hell out of them.
Now before you jump on me for that, I learned to drive on a Camaro, bought (and still own) a firebird as my first car, and own a new Mustang. Long before I belonged to, or ran this forum, I was a regular on the Fbody ( Firebird and Camaros) forums, and this was a regular point of "discussion" on there.