why do people do that?

today i left my glasses at the tennis courts and called my aunt to see if she would be willing to give me a ride back there so i could get them. she said she would, but when did i need the ride? i said whenever was best for her. all she said in return was what time, so i said now. on the way there she  complains about how it would have been better if i had waited till she was off work! I ASKED WHEN WAS BEST FOR HER!!!!

WHY do people DO that!!!? its sooo infuriating!!!