Both calling and folding are fine options, and if I think my opponent will fold to a four-bet too often, four-betting becomes acceptable as well. Really, all options are reasonable.
This is an excellent spot to call with most of my range. I want to call with three-of-a-kind because my opponent is drawing thin...I want to call with my draws because if I raise and my opponent reraises, I have to fold, and if he calls, I have no way of knowing if I should bluff it off if I fail to improve.
At this point, it is clear that my opponent is setting up the option for a sizable river bet. Because of this, I want to call with my draws to realize large implied odds on the river.
If I thought I could make my opponent fold a large amount of the time, I would consider bluffing. However, given his tendencies, I prefer to call.
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