Why can I use 'guys' in the plural but not in the singular vocatively

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Track title: CC P Beethoven - Piano Sonata No 2 in A

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Chapters
00:00 Why Can I Use 'Guys' In The Plural But Not In The Singular Vocatively
00:27 Accepted Answer Score 34
01:23 Answer 2 Score 7
05:11 Answer 3 Score 5
06:06 Answer 4 Score 3
06:56 Answer 5 Score 1
07:19 Thank you

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Full question
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Tags
#colloquialisms #vocatives

#avk47