I get that feeling sometimes. I always feel bad about it afterwards. Don't worry, he'll regret it later.
Source: I'm 16. I've mentioned my age on the Internet many times, every time I felt like a dick about it later.
PS: This kids writing annoyed me, I know I must be doing something annoying with mine that I'm not noticing, please point it out to me; thank you in advance.
Don't feel bad. Many adults don't even use commas properly.