To dream of graffiti may represent feelings about other people’s arrogant choices embarrassing you or disrespecting you. Feeling that someone else is being purposely obnoxious and not letting you enjoy yourself. It may also reflect a sense of powerlessness to stop someone from souring your social atmosphere.
Alternatively, graffiti may reflect your longing for peace and clarity.
If you are the one is creating graffiti it may be a sign that you really want to get under someone else’s skin. Embarrassing other people that you never have to care about other people’s feeling ever.