I don't know anything about boat shows. I've never been to one.
But, there has been a palpable shift in the broader culture and it has affected the boating community, specifically. Whether you agree with the way the article presents the issue, or not, it is pretty undeniable. Interpersonal skills are on the decline. Customer service is certainly not what it used to be. Camaraderie is based on a sense of what unites us and people have been increasingly focusing a lot on what divides us.
This isn't just me lamenting "the good old days". (Well, maybe it is, somewhat.) This is a general perception that I think most people can agree with. If it isn't your experience then you are either lucky, not paying attention, or under about 40 and don't really rememember a time when things were different.
In general, I try not to get too sentimental about nostalgia. There's no point in it. It just holds people to stand in comparison to people who lived in different circumstances. So, if this was a generational thing, I would leave it at that - that younger generations just have different expectations about how to interact with others (which they do). But, I have seen the shift across all age groups.
The most measurable way I have observed this shift is a general decline in basic courtesy - from acknowledging people you pass on the dock to the (formerly) obligatory courtesy wave when you passed another boat on the water. These have always been part of the culture until very recently. About 10 years ago, nearly everyone who passed each other on the dock gave some sort of greeting. And, if two sailors passed each other on the water, it was practically law that they wave. (Powerboaters ... not so much ... but they're often inside their box, so maybe they are waving - hard to tell.)
These courtesies are more than cultural affectations. They communicate something that is important - a bit of "we're in this together" - a signal that there are no complete strangers on the water.
I've seen these simple traditions on the decline over the past 5-10 years, but they've taken a sudden shift in the past year or two - from most people still observe them to most people don't.
Not to say that the culture is gone - it certainly isn't - just that it's gone from the norm, no matter where you go, to the exception - at least on the U.S. coasts. If you go north of Vancouver, south of San Diego, or just off-shore a bit, the sense is still alive and well. I have much less experience on the east coast and Atlantic, but I would expect something roughly similar.
As the great prophet Jimmy Buffett proclaims:
It's these changes in latitudes, changes in attitudes
Nothing remains quite the same
With all of our running and all of our cunning
If we couldn't laugh we would all go insane