Boss on a power trip

I work a crappy valet job while I am in school I’ve been working there for 3 years but recently they cut everyone’s hours I went on vacation in January June and I requested time off in September which has never been a problem and I get hit with this email. What should I do I only work 1-2 days a week. He always asks me to come in days I have school so he can leave early and I’ve done that job a lot of favors. I am in hvac school and got my epa so I am job hunting for a way better job. How would you guys react to this situation

Author: Maximum_Potential471