My apologies on misreading your post.
It still doesn’t mean I agree. My friends are all Gen-X, and I’m pretty close to my younger brother and his friends (Gen-Y), and all of them have suits, and wear them to weddings, funerals, etc… It’s what’s appropriate, unless you’re some sort of “dickhead man-child”, Big Lebowski Dude-style slacker, or greasy IT/computer dork who doesn’t even own slacks.
I will agree that there may be funerals where people don’t dress in suits, just like there are weddings where people don’t dress up. That’s a totally separate issue from flat-out not having a suit available for the more usual sort of funerals and weddings.
I guess my feelings are that if for some reason you can’t afford a suit, or can’t get hold of it in time for the funeral, then it’s better to come and show your respects than not to come at all. Hell, my wife’s family was most touched by some of the visitors at her mentally ill aunt’s funeral, and most of them were also mentally ill or extremely poor, and weren’t dressed in suits. They were just touched that they showed up at all.
On the other hand, if you can manage to shell out the $400 or so for a suit, shirt, tie, belt and shoes, then you damn well should, because it’s customary, appropriate and expected in normal American society.