The friend part is easy--they both worked together on Gilmore Girls and House of Wax, so I think the friendship is actually true in RL (though I have no idea if they're really BFFs or not).
I think the loveable douchebag is just a fandom trope, but where it originated I do not know. I don't know where a lot of people get "canon" for RPS. I mean, now that I've been reading J2 for over a year I can see how con reports etc. filter certain "facts" into stories, so it's possible that some of the CMM stuff comes from that--I know it's true, for example, that he's been known to date extremely young actresses--but I honestly don't know where some of the other stuff comes from.
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I think the loveable douchebag is just a fandom trope, but where it originated I do not know. I don't know where a lot of people get "canon" for RPS. I mean, now that I've been reading J2 for over a year I can see how con reports etc. filter certain "facts" into stories, so it's possible that some of the CMM stuff comes from that--I know it's true, for example, that he's been known to date extremely young actresses--but I honestly don't know where some of the other stuff comes from.