I call you Xiao Di Di as a term of endearment, that means, I'm
like your Da Jie like that. 
If I don't like you, I will never call you Xiao Di one!!
I also call SgPork Xiao Di when I meet him on outings because he's
a nice chap too mah! It's a sort of compliment!
Now, calling someone 'Auntie' is NOT a compliment... not whilst
you're still living on Planet Earth! 