Foul-mouthed

Today I was scolded again, but this time it was from a 4 year old boy... this sucks.

I was scolded because I was saying something to my sister and I said the word "wey", I don't even remember what was I talking about, but he said to me that I shouldn't use that word because "it is a bad word", my sister asked him why it was a bad word but he didn't know what to answer, she asked him if it was because "god" would get angry for using that word and he said no, then she asked if it was bad because of her mother and said yes, this made us laugh but I couldn't resist asking why he knew that it was a bad word and the kid said that because his mom would get angry and scold him, lol.