Uncle

Today 2 primary school kids approached me and asked me for the time. After telling them, the first kid said:"Thank you.". The second kid said:"Thank you, uncle.". Though my age qualifies to be uncle, I feel kind of not used to it. Haha. Any way, the first kid quickly told the second kid:"It is better to say sir than uncle." Then, they quickly said:"Thank you, sir." So who say kids nowadays no discipline? These two kids show that they are well-mannered though I was called an uncle. Hahaha...