Opening 3bb doesn't really seem to make sense pre against this type of villain. This isn't really all that great of a postflop hand to play OOP against a villain who doesn't fold pairs+. We'll get some value when we hit top pair (but it's a really high RIO situation), we'll never be able to bluff because he's never folding a pair (and we beat pretty much everything that isn't a pair), and we're probably mostly going to just be playing for showdown when we have an okay hand.

I don't know if this means we should go harder or not play at all (which seems nitty).

As for postflop, wutareyoudoing bet every street harder. As for river, fold. I can't imagine this is how he'd play a lesser two pair, and there are so many hands that are beating us.