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"Кто-то - ХХХХ ХХХХом." - "Smb. is a typical XXXX. (Or looks like typical XXXX)"
"ХХХХ ХХХом, а ..." - "... no matter of XXXX."

What?? :shock:[/quote]
Checked. I was wrong. :oops: No hyphen is needed.

Strange. I feel like it should be. :o

No, it is different construction. It should be written as "дурак-дураком".

Дружба дружбой, а служба службой.

I do not know what is omitted (if anything) but the very construction is used to emphasize that another part of the sentence is true independently of twice mentioned noun.