to laugh at (a person, behaviour etc) and show contempt

make fun of; insult

to take away (from the credit, value etc of something)

take away a part; lessen

to ignore, refuse to carry out, (something) by acting without respect

show contempt for

to make fun of, laugh rudely (at)

heckle

to say disrespectful things (about a person, belief etc); to eat (food) greedily

make fun of; despise

to show one's dislike by using a wrinkled nose and an insincere smile (and perhaps despising words)

mock, condemn

(to make) a short, unpleasant laugh (especially rude or to show lack of respect)

sneer

a foolish person

ridicule