Marketing being the keyword here.
You play games as well, like it or not racing sims are a genre within the video games industry.
You seem very nervous about your friends thinking you play video games, which makes nailing your 'sim' credentials to GTS all the odder, given that it's about as 'light' a sim as you can get. I mean even on the Playstation you could get far more 'willy waving' about this if you wanted to, and that seems to be your aim here. You don't want to be seen to be playing games and don't want to be mixed in with those who use a gamepad, which makes both your choice of title and platform all the odder as a hill to die on.
Myself, I play racing games, stretching from as full-blown a sim as you can get for the home market right to way down to the arcade level of (the utterly brilliant) Circuit Superstars, and I don't really care what control method those I'm racing against are using. As longs as the racing is fair and those taking part are enjoying it.
In all fairness, it is a sim, just at the 'lighter' end of the scale. Nothing wrong with that at all, it just makes
@Junkman55 stance come across as an odd hill to pick for someone who seems to want to be seen as the sim racing elite.