a big exception " little younger brother" :D

I don't understand... does "小弟" have some prurient connotation?

I'm really asking, not making a joke. This is the kind of stuff you don't learn in grad school 中文 classes.

Saw a waiter attack a Chinese patron in a bar in the Yangtze Delta about a month ago. Obviously he felt to have been spoken to in a derogative way.

They got into a fistfight and knocked over a few tables, then calmed down and the gentleman and his guest actually stayed in the establishment for the evening...Probably helped by the manager offering them drinks and food for free. ;)

this is the term

小弟弟

Lot's of fun ways to put 小姐 and 小弟弟 into the same sentence, but I would not recommend trying to do so at a restaurant on the Mainland.

Very true. In fact, don't use them in public....