If this were an entirely free country, I'd have the right to drive a car with no muffler or catalytic converter. If this were an entirely free country, I could rig up a sports car with a huge two-stroke engine, notwithstanding the burnt oil i'd be spewing into the air. If it were really a free country, maybe I could even drive without a license, hunt without a license, hunt people without a license...
Just as fair as encouraging a boycott of a shop run by people who live lifestyles that are not in accordance with traditional mores, "approved" religous beliefs, or published laws or any or all, eh?
But in order to be absolutely fair, you should encourage a boycott of the business of anyone who drives a vehicle of unreasonable size/fuel consumption/ etc.
If it were feasible, maybe i'd do exactly that.

In this country of freedom within reasonable limits, we can boycott almost anybody we want to.
The fact is, other people's wastefulness affects
me and I can complain about it and make purchasing decisions based on it if I darn well please. People out there who drive single-occupant automobiles to and fro all the time are putting combustion by-products into air and some of that air,
I breathe. People that use a 15mpg SUV where a 22mpg station wagon would suffice are misusing a resource that is for all of us, namely, clean air.