You seem to be talking about anyone who doesn't agree with you. That's the problem with the rhetoric, you're given one example and have to throw in disclaimers. A fully realized philosophical system wouldn't require that kind of back-tracking.
It isn't backtracking. It should go without saying that it is unreasonable to expect something of someone who is literally incapable of accomplishing that something.
It should also go without saying to no one does it alone. Unfortunately, the Randites seem to think that the entrepeneur did and owes society nothing. It's willful blindness that puts them in the same class as the Marxists, since both philosophies would require a basic change in human nature to work.
Of course no one does it alone. Hence why people agree to engage in various transactions all the time for mutual benefit. Rand's point is that I don't owe you anything just because you've been sucking air longer than me.