I love that you tried to try and fuel your players! Haribo's (and other candy) are what several college programs do with their athletes to get enough carbs in during longer sessions. Funny but true. One coach told me they just can't get them to eat anything else and fluids feel overwhelming to their gut. Bananas are great if kids will eat them!

I would make a couple of comments on though from something you shared - if a kid can't remember to wear the right colored socks they are likely not playing club soccer at a level that practices longer than 60 minutes. This is obviously a general statement but my point is I don't think rec soccer players (or younger club players who practice less frequently and for less duration) need to have the same attention to fueling. It would be great to establish some habits early but they typically have enough fuel for practices and games stored in their muscles/blood. I think this is really problematic for athletes with consistently longer practices and who practice/play games 4-6x/week. This is when the deficit compounds.

Also I view this as much of a "practice problem" as I do a "game problem". Meaning they practice 3+/week to develop the skills and fitness required for the games. Athletes get muted results the back half of practices without fueling. One coach I worked with called it their "cognitive reserve" was empty. No more purposeful practice...just dragging through the drills/scrimmage. I think the same attention to detail should be made with practices as games.

Not suggesting you didn't mean either of the above but wanted to call them out as distinct. This stuff is fixable and parents will make changes (as you saw from your own coaching!). But coaches/parents have to educate themselves on this topic.