I think the most common offenses are:
1. Poor awareness of others while walking, driving a scooter, or pushing a stroller. I’d also put running in that category.
2. Being rude to CMs
3. Being rude to or confrontational with other guests
4. Littering
5. Seat hogging / not moving all the way down
6. Pushing in front of others for parades (or saving a spot for 40 people)
I won’t even include having a family meltdown, since that’s the family’s business.
Obviously you do get climbers in limited instances though, a la the Mexico pavilion.