Well, I wouldn't let anyone drive my car that I didn't think was qualified to handle it. None of my non-Supra owning friends would ever get my keys. Especially when I put my turbo kit back on and will be expecting over 400hp... No fucking way. Not happening. My friends that have Supras with some power, sure. Why not? If they break something, they'll pay for it or help fix it at least.
I don't have an issue with letting someone drive my car if I know they can handle it and they're a close friend. Most of the time, I'll say no anyway.
I'm not really fond of driving other people's cars either, so I can understand that. But that's because I just don't feel the urge to drive someone else's car. I like driving mine enough. I like getting rides in other cars though.
One time, I was shooting a short film with some friends for one of their film classes. I wasn't the main character but my friend, the director/writer, wanted the main character to drive my car because it's cooler looking and faster(obviously
). We got into an arguement 'cause there was no way I was gonna let him drive my car, period. And we weren't going to rewrite the script to make me the main character and I didn't want to be anyway.