Couple Questions on reads

[Megenoita]

Some of the main notes we all take are probably:

*calls down with any piece
*chaser
*peels flop, folds turn
*etc.

But, I was reading a post by Ulysses where he talked about noting opponents who can fold smaller pairs. Aside from TAGs who we can pretty much assume will fold smaller pieces with too bad of a board, how does one observe the tendency of a player to fold a smaller pair?