Having admitted that you’re “totally against racial discrimination”, would put things to ease. I'm certainly proud of your response, and hoping you'd never fall into this trap again.

Your steamy anger, in my opinion, was not because you wanted a "Royal" treatment; it is due to the abrupt shocking system’s inconsistency. You're being used to following the same procedures for traveling outside the country. Had you known the system had changed, in your case, you would've avoided all that by simply having a multiple exit letter!

Again, your public apology is appreciated. No one is infallible.

Salam