My suspicion is that his friends probably love their wives, and he's using their occasional and exaggerated venting to support his weird misogyny. That, or he knows the two unluckiest and easily fooled men in the country.
No one with a brain will say that all American women are bad. This country is way too racially and culturally diverse for a statement like that to be valid across the board. It's just much harder to find decent women if your selection pool overlaps significantly with the suburban American mainstream, because that section of society is a materialistic, vapid, and alienating cultural wasteland. Decent women exist everywhere, but the proportions are lower.
I'm married and extremely happy. My wife has a dominant personality and I have a comparatively relaxed personality, I take things much easier yet I learnt from an early age (with help from my father) that you have to establish your boundaries. When my wife is being snappy or pushy I simply say "do not talk to me like that, I do not appreciate it" and I rarely have a problem beyond that.
I know how I should be treated, I know exactly how much respect I should be getting from my spouse and despite being an easy going person I know I have to stand up for myself because if I don't I'll end up a pathetic divorced loser like so many people do.
Edit: I'd also like to add that most of my friends are in stable happy relationships. In fact I'd probably say my friends in relationships are happier than those who aren't, and I simply don't buy the whole 'getting married makes you unhappy' BS people purport.
No reason or need to take what he said personally. He's speaking of his own experience, and not accusing you of anything.
But now you're saying he's a misogynist. He might take that personally, and for good reason.
Rather than "evidence" I should have said something like, please provide us with priors that may reinforce the opposite belief. That isn't to say that you didn't already provide some, but it was also obvious that you took this personally, which detracts from what we are looking for (balanced priors).
Also, from a purely pedantic point of view (which I often take for its own sake, nor am I really partial to a particular viewpoint), I don't think any of those census numbers debunk anything, if we're talking about how a marriage may be a bad decision.
Nevertheless, there is only one kind of spurious claim going around here: blanket statements. Whomever believes them makes a fool of themselves, but we -- at least I am -- are still interested in hearing more perspectives :)