What are your thoughts on me choosing to be short with the company director of the chain restaurant I work at?
Is it because you feel you were treated unfairly?
Yes that's part of it, but there's also another reason
I'm sorry that happened to you. It sounds like you made a good call leaving there, as employers who don't treat their employees fairly are the worst!
He can suck it. I am going to make things difficult for him.
It's understandable that you are upset about being treated unfairly at work. Employers should always treat their workers fairly.