Is candy a noun

Prescriptive grammar says candy is non-countable. However, I think in colloquial English, both countable and non-countable forms are perfectly acceptable:

1) I like candy.

2) Pass me a candy.

To test that "candy" is non-countable in example No. 1, try replacing it with a Word that is widely accepted as countable:

I like Apple.[incorrect sentence]

Grammarians may argue that example No. 2 pass me a candy is sloppy English, but I suspect most would agree that pass me a piece of candy does not sound natural.

A user from a website gives the example how much candies do u want, which is indeed incorrect but because she's using the countable form of "candy" by making it plural. The sentence can be rewritten as:

How much candy do u want?

In other Words, "candy" is non-countable in formal English, but can be used as either countable or non-countable in informal English. And, yes, formal English would dictate the construction pass me a piece of candy.