[header] How to stop fighting with a stubborn parent [title] Assess the reason for the stubbornness. [step] Ask your parent about the reason for the stubbornness. Be sure to ask in a polite manner. 
You could try saying something like " i think i would be much less upset if you could let me know your side of the story. Why is it that you are saying no to this? " [substeps] If this causes your parent to become angry, consider letting it go and moving on or trying again once your parent as calmed down.