Good observation. Passive play screws your reads all day long. It's important to know when it's correct to call down against a loose aggressive player. Passive beats loose aggressive. Just make sure you have a set of sevens in YOUR hand.

I think a big mistake new players make is raising at the wrong time, and calling at the wrong time on a flop. If your hand is strong but vulnerable, it's time to measure your opponents strength. There are three reasons I see to raise on the flop, though I'm no expert....

1. For information
(to measure the relative strength of your hand).

2. To protect yourself against a draw
(Or make a draw pay extra).

3. To make your opponent fold right there.

If you have the best hand, and it's not all that vulnerable against few opponents, then it's the wrong time to raise an opponents bet on the flop. Especially an aggressive opponent. there are good times to smooth call aggression, but you can't leave your hand unprotected just to make a point.

I played against a guy last night who would see every single flop. Then he would min bet every single street if first to act. He would min bet, and you would raise him with top pair. He would call and min bet right out on the next street. It would screw with you because often a really strong hand min bets to induce a raise. This guy was doing it to induce calls so he could draw on you.

One hand I raised him every street to 5 times his lead bet. he called every street and showed down 5th pair. A pair of 5's ace kicker on a 9 5 K T 6 board. I flipped over K8.