From Longman Dictionary of Contemporary Englishlaugh at somebody/something phrasal verb1 LAUGHto make unkind or funny remarks about someone, because they have done or said something you think is stupid SYN tease I’m afraid the other kids will laugh at me because I don’t understand.2 SERIOUS/NOT JOKINGto seem not to care about something that most people would worry about Young offenders just laugh at this sort of sentence. → laugh→ See Verb table
Examples from the Corpus
laugh at • Most of the animals like a bit of a giggle and the hyenas will laugh at anything.• Students who took the course were laughed at because their faces swelled up and they walked around with their heads in bandages.• I can't help laughing at him.• I saw him flush it down the toilet so that no-one will laugh at his spotty chest in the showers!• Samantha spent the night laughing at me.• Today, I hear them laughing at reasonable demands they would have previously paid.• Behind their departing backs, Ladislaw laughs at the incongruity of the engaged couple.• If Cassie had not been so consumed by rage, she would have laughed at this last and patently childish remark. 