He got banned for holding up a sign... Any sign. This is a safety hazard.
I understand that policy for safety reasons.
However, I refer you to Post #6 here from Revel, who wondered if they would have enforced the ban against a Hillary sign.
You do know that posing for the Splash Mountain cameras in the Disney parks has been a "thing" for years, right?
Some even hold up signs - advertising websites, proposing marriage - you name it.
And then there are the old "Flash Mountain" website pics. No bannings came from all that, though, that I can recall.
#8. What “safety hazard”? Are there low-hanging wires or steel beams to hit the sign? If so, they are the “hazard”.