That's pretty harsh and really incorrect. Some people didn't have great role models growing up to teach them these things and have to learn them themselves later on.
Edit: spelling.
I abhor the single-use plastic, but at the same time water balloons are just fun in the summer. If paintballs can be made biodegradable (they're gelatin), maybe there's hope for water balloons, too.
After all, 90% of drivers have above average skill!