These are idiomatic expressions
laugh at: to show that you are happy or that you think something is funny by smiling and making a sound from your throat.
sentence: laugh at her ignorance and she'll suffer for it.
listen to:
To make an effort to hear something: listen to the radio; listen for the bell that ends class.
sentence:
"She encouraged me to listen carefully to what country people called mother wit" (Maya Angelou).
