[jrz1972]

Here's another way to think of this. Against the typical Party .5/1 6max player (fish), we tend to play marginal to decent hands pretty aggressively. We do this because the fish will call with all sorts of crap we beat, and he won't play back even when he's got us crushed. When a fish check-raises you, it's really easy to get away from middle pair.

The person you've described is sort of the opposite. He'll play back hard with all sorts of hands, which means sometimes you'll make the mistake of calling down with a loser and sometimes you'll make the mistake of getting pushed off the best hand. You want to avoid getting yourself in the position of making either of those mistakes, which means not betting as much and walking into fancy check-raises. It also means inducing bluffs.