Nope, not at all. It really just depends on how you wear the jeans and what you wear them with. If you wear five inch heels under your skinny jeans and a tiny shirt, sure, you'll look trampy, but other wise it's all good.
Just wondering... but do normal jeans really make you look shorter? I feel like skinny jeans make people look a lot shorter as opposed to normal/slightly flared jeans since these jeans extend your leg and make it look longer. Skinny jeans kind of just cut it off at the ankle.
But anyway, go and wear whatever looks best on your body (when all clothes are concerned). If skinny jeans look better, wear those!