Why do you think your post count has anything to do with the member's response you quoted? He presented a very respectful and coherant response to your post...
Anyways no, the RX is not an SUV. Anybody who thinks it is didn't research it enough before they bought it. Its on the Camry platform. Its a crossover, not a true SUV like the GX or LX.
However, somehow I can drive a car in the snow without wrecking it so I could certainly drive an RX. People who can't handle one don't know how to drive in the snow, period. 4WD helps you get started from a stop, and the RX has an AWD system that will do that. For turning, stopping, an SUV is going to be no better than an RX.
The RX is hardly unique in that field either, every carmaker has crossovers and more and more people are moving, happily, from SUVs to them. The RX, Acura MDX, Infiniti FX, Ford Edge, Lincoln MKS, Cadillac SRX, Mercedes R class, BMW X3 and X5. All of them essentially cars.