I don't want to be the parent that say my little Johnny is ..... but geeze man, maybe there were two little pecker heads at taco bell, but hell blame the parents for the kids actions. I'm old school and think that children should behave themselves all the time when out in public, but you were at a fast food place and parents usually let the leash go once inside. Now that you know this, you can either stop going or leave when a parent comes in. Or approach the store manager that earns a whopping 30K per yr and have him/her take care of the situation. Good luck with that by the way.
I keep my 2 daughters close by as much as possible, but kids are kids and if I had to bet, you were one too once. It's not that serious, breath deep and exhale slowly, smile and try and enjoy the youthful banter.