You seem to be conflating two unrelated points. When people say "tourists need to go home" or "we need less tourists," they aren't referring to some philosophical argument for the existence of tourism as a gauge of economic health for the middle class.
These phrases are almost exclusively speaking in regards to tourism's negative effects on the local environment and population. Heavy tourism has a tendency to cannibalize an areas resources and then alienate or push out the native population.
I'll copy my response to the other person who was also confused by the reference:
In America, there's a very popular car windshield decal sticker that people put on that says "Salt Life." It specifically just means someone visited a popular beach vacation spot called Myrtle Beach, SC. The people who put it on tend to being almost exclusively sporty douchebags and suburban moms.
That's about it.
Edit: changed NC to SC