As is often the case, people confuse a "autonomous cars are not for me" with "autonomous cars - what nonsense, should not be allowed!"

That particular claim I personally witnessed only once or twice - which counts for little. However, I've seen the more general pattern all too often: "I personally object to X, therefore X should be forbidden for everyone." Gay marriage, abortion, THC, you name it. It's rare to find a stance of (hyperbolically speaking) "I object to that activity, but I will fight to the death for your right to do it.", or even to legally tolerate it. As such, even a priori (but based on the posteriors on many other issues) I'd expect for that pattern to apply to autonomous cars as well.

Instantiated to this instance: People who don't want autonomous cars because they deem them unsafe, or because they prefer to drive their SUVs themselves, would not mind taking away the rights of others to use them. At least, that's my claim.

(If someone feels strongly such a phenomenon does not exist and we find a good way to gather broader evidence, we could set up a bet, going to a charity of the winner's choice.)