You have to know why that move is bad. Then you can punish it :)
Punishing bad moves....
@tigerprowl10
By punishing bad moves I mean to take advantae of it, the logic makes sense it has nothing to do with country, also the british flag resemblence in our flag is inpired by the union jack.

I have seen some players resist the urge to take immediate material advantage of a bad move. Instead they prefer to build the pressure, knowing that their opponents weakness won't disappear. I am thinking, for instance, of play against a weak backward pawn.

First you need to know a move is bad? Second, you need to know why a move is bad?
Third, there are many ways to punish a bad move. Often tactics will do it. However at other times the move is bad but not all that bad and you have to gradually build up your position.
If you learn to recognize 95% of bad moves played against you and if you learn why these moves are bad and if you learn how to punish such moves, then you will be at least a master rating.
How would you punish (Take Advantage of) a bad move made in chess?