Legitimately if you feel a non-disabled person might be using something, shut your fucking mouth because unless you KNOW they aren't disabled in some way, you're just mocking someone for having an issue that isn't immediately visible, and you're a cunt.
I just had this conversation internally with myself while eating lunch in a parking lot. On the surface, it looked like some twat with more dollars than sense parked their fancy gimmick car in one of two reserved wheelchair-accessible spots because they would "just be a minute" and rules only apply to other people. It might even be true. BUT. I don't know that for sure. Giving someone the benefit of the doubt takes zero effort. Do better, me.