Should I use singual or plurar for noun after "to all"

Question

I was wondering if I should use singular or plural after "to all". Instinctively I would go for plural, but when googling, the only example I found was a song title: "To all the boys", most other samples used "singular-looking words" like "To all the people". So I don't know if it's "art grammar" (like gramaticaly incorrect but OK for song writing) or just the right thing.

As far as I know, 'all' can be used for both singular and plural forms (1st answer), so I don't know if I should use plural or singular in this sentence : "To all the fanboy(s) ..." and why so ?

Sorry for my English, I'm not a native, just please ask in comment if I'm unclear.

Edit 1

My expected full sentence would be: "To all some_technology fanboys, permit me to quote "...", so joking about people who defends something I disagree with.

Answer 1

It is always good to give a full sentence when you ask a question. Your examples are slightly confusing. By reading the comments I understand that you want to make sure you can use plural after all in

To all (the) soccer fanboys

NGram tell you that both singular and plural nouns are commonly used after all. (Note that to all the is more common than to all without "the").

Cambridge describes the use of all saying

All means ‘every one’, ‘the complete number or amount’ or ‘the whole’. We use it most often as a determiner. We can use a countable noun or an uncountable noun after it:

• All my friends are away at university.
• All information about the new product is confidential.

And you can find plenty of other examples with plurals after all on that page.

Without context, without knowing if this is some kind of dedication or part of a sentence, it is not easy to discern if the is needed or not. But Cambridge does give a general guideline:

All with no article

When all refers to a whole class of people or things, we don’t use the:

All children love stories. (i.e. every child in the world)

Not: All the children love stories.

If you have in mind a particular group, then you would need the

To all the soccer fanboys (here present, that attended the match, etc.)

If you rather think of fanboys as a class of people in general, you can just say

To all soccer fanboys.

Answer 2

You should use the plural. Both your examples use a plural word.

Boys is the plural of boy. (one boy, many boys)

People is a plural of person. (one person, many people)

As I note in a comment, "person/people" is a strange couple of words, but in this context, people is a plural noun, and functions as the plural of person.