Well if that is the GPs position I challenge him to come out and admit it and we can debate that argument. Its just dishonest otherwise.
The biggest flaw in that argument of course is that the only thing between Bill Gates and a homeless guy with no money is one day of terible luck. And since you are not Bill Gates you need a lot less bad luck. Even if you are sociopathic enough to think that way you should be smart enough to figure out it makes sense to cover the poor in case you join them.