Hie .... He has difficulty controlling and expressing his anger,the individual should be advised to be aware of his anger . you can recommend to any psychologist and counselor for the same.

Consult Psychiatrist

I will say that he has difficulty controlling and expressing his anger. While using derogatory names is disrespectful and can lead to consequences in public life, the individual should be advised to be aware of his anger and decrease this behaviour by himself, in private life, too, initially. If it is proving difficult, then he should consult a registered psychiatrist or psychologist. Sometimes, there are some underlying issues that may need to be resolved.