Yeah, what's the deal with this, anyway? It's something I've noticed as well.
The worst case seems to be US Expat Surfers living in Central America, preferably owning property there. None of those guys seem to have been surfing at all in the last month, but they're certainly quick to make sure you know you're not welcome intruding on their waves or taking up a table in their personal favorite bar.
I was actually considering setting up shop down in Nicaragua at one point, but that factor quickly put me off.
Check out the Expat Climbers you find in SE Asia for the counterpoint. Mostly nice folk leading pleasant lives in a pleasant part of the world and getting out on the rock all the time. Figure out what's causing the difference between those two groups and you'll have the secret to happiness.