Spur review: unprofessional management

I am sending this email to lodge a formal complaint against the operations manager at Little Creek Spur, Tokai.
I was a waitron at this store for quite some time, but recently resigned due to the lack of proper management, discrimination against my sexuality and very offensive verbal encounters with the second in charge which has done nothing but break my spirit and bruise my character as a person - to the point where I no longer felt any form of enjoyment coming in for my scheduled shifts. Where I no longer had any motivation to even do favors for the store anymore; such as planning theme evenings, like Valentine's Day decorations and Halloween decorations etc. These events were always things that I looked forward to until I reached the point where I no longer had any motivation to lend my assistance.

On Monday, the 3rd of February I decided to treat myself to wholesome a lunch at Little Creek instead of the Spur right opposite my new place of work. Because despite all my feelings towards the management of the store, it has become my second home, filled with friendly and polite faces that have become my family.
During my time there that day, I had one glass of cool drink whist I was in the smoking area, and at that same time my high school teacher had come in and we decided that we would get something to eat together and catch up. But before I could sit down and eat with her, Warren had called me over and told me that I was no longer welcome in this store. And I was told where the door was and told to leave.
I then had to go and tell my ex teacher that I could not have lunch with her because of what I was just told by the operations manager.
I found the whole ordeal very uncalled for and very very embarrassing. I did not cause any scene, I did not disturb anyone from their work. So I therefore felt like there was no reason to be told to leave the way that I did.
I feel that it was very unprofessional, coming from my ex superior who always preached about professionalism towards customers to me when I was an employee there.
My main concern after this incident, is whether I will be told to leave again when I come and have lunch at Little Creek with my family. Will he always have something to say to me each time I come to the store with my family or on my own for some quiet time. Like he has each time I have paid a visit to the store.

This complaint is not a ploy to get him into any serious trouble, but if I had treated a customer the way I was treated and spoken to, I would've been reprimanded by him as my ex superior. I feel as if whoever receives this email should take the necessary action, as his superior, to sort this matter out. Because it is highly unprofessional and unnecessary.

Kind regards.