Earlier quoted context omitted.
The computer didn't kick someone out, the security people did.
As we get used to "the system flagged you" situations, people get step by step removed from recourse to unfair rulings. If I have to spell it out further for you, maybe you won't see a problem until you are personally affected. I understand, it's a fairly common posture.
So the slippery slope fallacy?
The unfairness here came with selling someone a ticket to a venue they are prohibited from accessing. Solve that problem and the rest of the "unfairness" goes away.
… And if you are incapable of responding to the argument without snarky running commentary, kindly refrain from replying.