When you belittle someone, you say you have a right to do so. But this right is only in your mind. No one has in reality any right to belittle.
When you belittle anyone, you hurt the ego of the other person. The hurt you cause will come back in some form at a later date.
When you belittle anyone, you had a choice to explain to the person your point of view, without resorting to belittling. You could have explained your point of view without getting upset.
When someone has the power to upset you, so that he belittles you, it means you have given him power. The power can upset your equilibrium. No one should have power to destroy your inner peace. What someone does can be handled without emotional turbulence at your level ! Give no one that power. Keep the power within yourself. Just be calm. Don't belittle anyone.