Sometimes he/she rubs it in your face. What do you call the instance of this action? What do you call this action?
You could consider the adjective "unmagnanimous". Whilst not exactly what you're looking for it could work in the context you describe.
It's an antonym for "magnanimous", which can be described as follows:
adjective -very generous or forgiving, especially toward a rival or someone less powerful than oneself.