User Titles

First of all 2 sorry
the 1st one for digging this post.
the 2nd , unless I am missing something I did not find the meaning , in terms of post count of the titles, since the name of this tread is misleading. It should be username colours.
Anyway here goes my question: the postcount for the usernames titles. all I know is from 0 to 60 (?) are Bananas.
A 2nd question question is Banana from a cantonese slang?

 

Banana = Yellow on the outside White on the inside

 

I wonder what is it called if it's the opposite of banana... like ppl who are born in canada but loves hk stuff

 

An Apple.