Is it normal for boys to pee all over locker rooms and public restrooms?

A couple years ago I overheard my two oldest boys, 11 and 13 bragging about where they've peed, mainly at school or locker rooms. Now I'm not totally naive, I know boys will be boys, so I could imagine them peeing in the showers or missing a urinal, but I was shocked and concerned about where they were peeing.

A few months later I signed my little boy 4 for swimming lessons at the city pool. The lessons where an hour before they opened to public. Since it was only little boys, many moms went into the boys room to help them as girls and their moms where in the girls room. As we walked in I was shocked to see a little boy standing in the showers alone, peeing, without even the showers running. Before we even set down our bags I noticed a boy walk to the end of the row and pee against the wall.

More than a dozen boys and moms had walked in as my son undressed. As they did the little boys where peeing all around us. As this was happening one of the young female coaches walked through and welcomed all of us. As she walk past us my son said to me, "mom I gotta go pee." Despite what going on around us, I said okay and grabbed his hand to walk him to the restroom, especially now that a coach was there. A second much older female coach walked into the room as the younger coach stopped us and said to me, "you know, you don't need to take him to the restrooms, the guys never use them." I must have looked uncertain, because as the older coach approached she announced, "moms, I presume you all realize that as the boys get older they pee everywhere but in the restroom, so unless you're really squeamish about it, just let them go." "We hose the place down a couple times a day anyway, so let them have their peeing contest or do it against a wall, if their shy, it not a problem."

How normal is this? How many boys do this? Do coaches, guards, mom, dad know you do? Moms, coaches, have you seen this, do you care? Girls ever done so?