Replying to So i was tardy to school?

So i get to school and i find that i have my moms keys....so i call my mom and take them back home....she writes me a note saying what happened to excuse my lateness...i get to school and i give them the note and the lady says your still late and its unexcused...i was like well i had my moms keys and she had to go to work...i said why am i still considered unexcused...i have a note from my mom...they say...well you couldve ridden the bus..the moral of the story is...1. schools are retarded
2. i have a tardy now so i cant come in late anymore..
3. it wuoldnt have mattered if i rode the bus or not...i still wouldve had my moms keys

and now i might get called down to the office because i got smart saying...it wouldnt have mattered if i rode the bus or not and walked out.....atleast skiing after school will help