Even as a younger person, I'm as grouchy as anyone. Age plays no part.
And the young 'uns who bum around and document their lives in incredible detail bother me. Wealthy people bother me. I want a piece of their pie. So does everyone else. It's natural.
It's also natural to look down on professions that are perceived as being less valuable to society. Folks generally respect doctors more than strippers, cops more than porn stars. The free market, in its infinite wisdom, allocates plenty of value to those professions, but most of us still feel a less respect for that industry. It's not communist to disrespect the paypal sailors. It's just good old-fashioned holier-than-thou.
Frankly, I think those blogs bother me the most because they reflect the incredible selfishness of our chosen lifestyle/hobby of sailing & cruising. If everyone lived out dreams, the world would stink. Some people have to take out the trash and clean the public toilets for the rest of us.
So the old school
sailors bash the begging bloggers, the small boat sailor's bash the big boat sailors and, of course, the sailboaters bash the powerboaters.