If a person has a company of bad friends, either because his friends have begun to adopt bad qualities or they were bad from the beginning then he should try to gradually distance himself from them and leave their friendship. He should not make a fuss, or get into fights with them, but he should do this wisely.
The scholars have suggested that when a person is caught in a bad company than the affects of that company begins to permeate him. Similarly, if a person finds a good company then the affects of that company will influence him and make him better. Some experts have also suggested that if there is a group of bad people around a person, no matter what they do in the world, they cannot change the qualities of that person after he has been affected as long as he’s with them, same thing vice versa. So company of good people is extremely important, you should acknowledge that and leave your bad friends.