Ok, here's my two from this week that prompted the question, now that I know I'm not alone:
We were in the Indy LL, the part where you're basically just walking through without stopping. I hear two boys behind me complaining that "the old people in front are too slow," and I can tell that he is very close behind me. (I'm clearly over 50 but I was with my 20 year-old daughter.) Few seconds later he kicks the back of my shoe with his foot from being so close behind me. I ignored it. Maybe 20 seconds later, he does it again, so I came to a dead stop, turned around and gave them the death glare, at which time I see they're two boys, maybe 10 or 11. They give me a very sheepish look and I assume I'm done with them and continue on. Didn't see a parent with them. Then maybe another 20 seconds later, one of them steps on the back of my shoe hard enough that it almost comes off and nearly trips me. So I turned around again and said, "You need to stop that. Now. Back off." Then they start saying they didn't do anything, and they evidently were with parents, who have now caught up (guess they were also old people who were too slow). Of course, they told the dad they weren't doing anything, but the dad apologized. Ordinarily I would have complained directly to the parent rather than talking to someone else's kid, which can get you in trouble, but in this case it worked out ok.
The second time was on Pirates. There was a woman with her adult daughter and an adult male who was either her son or the daughter's SO. They were in the row behind us and were talking LOUDLY throughout the first part of the ride. At first, it was just one of them telling the others what was coming next (drops), so I thought maybe they'd stop after that, but no, they keep on talking loudly about something stupid, like something that happened at work the day before. Like outside voices I'm the center of the universe loud or I've had a few drinks loud. Eventually I turned around and said, "Excuse me, but would you mind talking a little more quietly. This is my daughter's first time on this ride and we can't hear what's going on because all we can hear is your conversation." A decent human being would say, "Oh, I'm sorry, I didn't realize," but no, these clowns are like "Oh my god, did that just happen!" They can't believe I'd ask something like that and start laughing, singing, and talking even louder. Which I knew was a possibility but for some unknown reason I though they might be actual grownups about it. So I told my daughter we'd just ask to ride again when we got off, which we did.
CMs must be pretty used to that kind of thing because they clearly had a system in place for it and put us back on pretty quickly.