You should consider your position in deciding whether to limp or raise with small pairs 55+ but even in late position i'd raise with 44,33,22 only if the blinds are very weak.
People might keep betting into a tight opponent if they feel the guy would have missed the flop. Let's say you only see the flop 20% of the time, then when the flop comes 9 62 it is very likely that you missed the flop so the guy is correct to bet into you and take the pot.
By the same logic, a flop like that is likely to have missed him too so you can call depending on the odds
and whatever draw ou might have.