Not only can I picture it, I've witnessed it first hand. Was it as bad as this one? No, not even close. However, one night on the Fantasy there were two extremely drunk guys shouting and cursing at each other - dropping F bombs right and left. Their companions were yelling at them to stop, you get the picture - pretty much chaos right next to the elevators in front of a lot of little kids. At one point they did start pushing and shoving each other and that's when DCL CM's stepped in and security was called. So yes, this could happen on Disney. It can happen anywhere you have a large group of people in a contained space.
As for the poster claiming people that can afford Disney cruises wouldn't act like that
, remember the video of the woman throwing a fit in the middle of the airport because their flight was delayed and they were going to miss their
Disney cruise? Yeah, that was classy!