Remember a similar discussion about Rosemary? I don't like the bad karma these "few" are projecting onto the place as a whole, but I can see both sides.
I'm all about Seaside's beaches (the sand) being public- I walk through there all the time. I don't park my chair there because the beach is scrawny and there are many beaches along 30A that are far superior.
I don't think it is out of line to buy lunch and eat it on a walkover or beach, but I do think it is out of line to pull up in a car or pull a wagon full of beach stuff and use the walkovers as if you were staying there. That falls under my "rules of use" test- would you just walk into a resort, condo, or hotel and use their pool, exercise room, or other facilities, just because you dined or shopped there? If you are not staying there, you don't have the right to use these amenities. Apparently this is happening too often and has become noticeable to owners, and I am sure it is aggravating.
I do think it is a bit snarky to be nasty about the Seaside back roads. If someone wants a nice quiet road, they should live in the country, not in a uber high-density community. Just 2 cars seem like a traffic jam because of Seaside's design, but hey, if you like that design and bought in Seaside, you better learn to live with the negatives too. It is my understanding that these are public streets, and we can walk or drive on them. It's a little late in the game to gate off the residential area, and I really doubt that was the original intention of Robert Davis and the New Urbanists.
So, what to do? I will continue to enjoy what Seaside has to offer the public- events, shopping, theater, dining, Bud's, the big "bowl". Why would a town center have been built if it wasn't intended to be a real town center? If somebody that lives there doesn't like us being there, too bad.
This is just a guess, but I bet that many of the unhappy Seasiders have their primary residences in gated communities. Which means they could never understand the concept of Seaside anyway.;-)