What custom does Hamlet dislike Why?

Hamlet dislikes the custom of courtly revelry and excessive drinking, particularly as embodied in King Claudius's celebration following King Hamlet's death. He finds this behavior distasteful and feels it reflects moral decay and a lack of respect for the deceased. Hamlet is also troubled by the hasty marriage of his mother, Gertrude, to Claudius, which he views as a betrayal and an affront to his father's memory. This discontent contributes to his broader feelings of disillusionment and existential despair.