This is a big reason why I'd never live in a place with an HOA. While I don't necessarily agree with the truck owner about his trucks appearance, personally I'd rather see it painted, even a brush/roller/rattle can paint job would be better than it is now (but he's probably not allowed to work on his cars at home either), but IMO that's beside the point. It's his truck, if he likes it like that, that's all that matters. Get over it. I can't imagine what kind of A-hole forms an HOA and then does this to his neighbors.