Quit my job recently because the manager was awful. He sent this to me when I left after dropping off my key a few days later.

Context: I'd worked with this person for over 3 years, and we had a one on one meeting where I aired out all my grievances, specifically how he shows no appreciation to his workers. Ended up having an argument with him for like 15 minutes. Went to drop off my key a few days after the last day I was there, I dropped it off without saying anything to him.