To be jeered at for our beliefs is often part of a spiritual testing, so experiencing it in dreams helps to clarify those beliefs.
Psychological / emotional perspective: To experience being taunted or mocked in dreams may be interpreted as an attack on our self-esteem.
Material aspects: When we do not seem to be experiencing success in waking life that part of our personality which inhibits that success may appear in dreams to jeer at us.
Gives gender - specific: In a man’s dream the one who jeers may often appear as a parental figure, sometimes of the opposite sex. In a woman’s dream it may be her shadow which mocks.