They are not similar, but the point is that they are also not as bad as advertised by people who don't know better.
And as I said, I get the joke, but it's also very disrespectful and feeds into the narrative of some Cowboy haters. Here's my bottom line to both your points above: All these people who make sneering remarks about Irvin's coke/crack habit, need to tell me WHAT THEY HAVE ACCOMPLISHED IN THEIR LIVES. Ok, so you had "no cocaine" and didn't do squat...but because he did...that diminishes his work ethic, skill, leadership, sacrifice, etc?
So again...in my book it is designed to "take away".