There are things this article hasn't addressed that shore towns have to deal with. Its not just a "don't come down here and infect us".
In the off-season, many of the businesses, including liquor stores, restaurants, bars, stores etc. close down because the year round population can't sustain the volume of businesses that operate "in-season". Even the grocery stores cut way back on what gets put on the shelves, what is brought in for fresh fruits/veggies/meats etc.
Unless you live year round in a shore community, you probably don't think of things the way the locals do. Any substantial non-seasonal increase in demand overruns the normal supply of goods and services. On the other hand, staying where they have their permanent residences, the infrastructure of goods and services is built to accommodate them there.
So while you may say F'em, there are legitimate reasons for the locals to feel the way they do.
Regardless of you feelings the summer people have just as much right to use their property as the year round residents. They bought it and pay taxes on it and therefore have the right to enjoy it whenever they want. Their property rights are just as valid as the rights of the locals.