Originally Posted by Freebase Dali

So would you prefer I call them "People who dress like they're going to a tennis match, drive expensive cars, act snotty, wear pink, and generally radiate douchebaggetry"... Or simply encompass it in a single term called "prep"?

It's not a generalization. It's a compression of observed features into an easier to say name.

If the guy isn't a prep, I won't fucking think he's a prep, thus, I won't refer to him as one.

I don't expect you to understand the common sense in that, but at least respect the fact that intelligent people do.