They are paid to act in a no-nonsense manner given the safety of the players is paramount. There is no guarantee the security staff are even familiar with what they are guarding.
Nobody is paid to listen to declarations of being Superman / President of the World / Tupac / Elvis or whatever else you care to name. Show the creds or GTFO.
Exactly - show some creds. A competent guard would ask this instead of just shoving him again.