To be judgmental means to declare something that someone did as right or wrong, so with Biblical support it is perfect fine, infact encouraged, to point out to someone when they are doing wrong. Besides Jesus, the main point of the Bible is to point out what is right and wrong, and Jesus certainly made many judgmental statements against the Pharisees and the Sadducees. To judge, on the other hand, means to pass sentence upon. To say that someone should not have a chance to be forgiven and should goto hell is the kind of judging we are not to do.
I think you better look who Jesus hung out with and singled out to have a conversation with. Before Jesus, God even controlled certain people's destiny that where running away from him.