So my question is, without anyone defining "rules" up front in a PuG, was I out of line? .
No, you were not out of line at all, for the reason i put in bold.
Without any defined rules, and once everyone else had voted greed, you were fine.
You could have asked, and they might not have cared at all.
But they said nothing, either.
These are the same people that quit because people don't spacebar (quickly enough).
Forget 'em, be happy they're on ignore.