The main burner on a gas fridge is a tiny pilot flame...nothing more. I run my fridge on gas from the house to the campground including the gas station. The flame is 4+ feet off the ground and unless you squirt the gas nozzle into the vent cover behind the fridge it is very unlikely that you will have a strong enough concentration of vapors in free air to ignite.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.