I need help my boyfriend needs some new jeans 4 skool this year the 1s he wants are $19 but his mom said no?

she wants to get $15 crappy ones so we told her no he wants the others 4 personal reasons n she said she could only get 2 of the 1s he wants so i said how many more r u gonna get at the other store when there's only a $4 dollar diff n bing im that im his gf she got pissed who do you think is right cuz i really dont see why shes actin like a ****** i think she should b lucky that he doesnt want 40-120 dollar jeans like most people (btw we are 17 so plez take that into consideration with that prices of the jeans) thanx