Not sure what to think - scary or stupid?

I was just walking home from getting my new glasses. It's raining lightly and I have my umbrella up (yes, I even do that when its raining). Some guy in a slightly sporty, red ford or holden thing of a car stops on the road I am crossing and says,

"You alright or do you want a lift". For all the world like he knows me.

I frown and say no. My look says it all. He replies something like - just trying to be nice/helpful - and drives off.

I shake my head and wonder if I should contact the police or was he just some idiot.

Is he one of my neighbours? Did he think I was an old lady who needed a lift home? Did he think I was young enough to be interested in - legally or illegally? Did he think I was stupid? Did he have a brain? I mean, it's nice to be nice, but surely you know that anyone you offer a lift to is going to be suspicious and a little bit of rain doesn't actually hurt a human being.... Logically the nice things just doesn't gel. Logic says only predators do these things.... Desperate to meet women? Going to continue to be if so, whatever his reasons - he's a crazy.

I keep thinking I must have made a mistake and known him somehow.

I looked at police websites but there isn't anywhere to report suspicious behavior by email. Hopefully he's not some nasty rapist type. Just in case:

He was wearing some sort of hideous yellow t-shirt - possibly yellow and black. Like some sort of work shirt. He was a bit jowly - like he's carrying a bit of weight, but he didn't look 'fat'. Clean shaven and fairly fresh-faced. Age - hmm - 30s? Brown hair. Ordinary bloke - mechanic type. Car had spoilers, but I didn't notice the wheels (I'm a disappointment to my family).