It would typically mean he is either quite rude, or just has no manners.
However, it is possible he was only scratching his nose.
i am a smelly boy that picks my nose
AN ERGONOMIST PICKS HIS NOSE
No he picks his nose!
rhinotillextomaniac rhino=nose, tillexto=habit
he is a nerd that picks his nose and eats it !!!!!!!!!!!! lol
no he picks his nose and eats it and then digs in his but
a baron picks his nose all day
she picks her nose and stares at herself all day
a person who picks your nose at night time JOOKKKEEESSS! He is a part of imagintoin
He's addicted to Diet Coke and he picks his nose.
As in the answers right in front of you, but you just don't realize it, and so you can just pass it by.
Life is just unfair that way!