I want to replace “scavenger” with something in this exchange, but I can’t really think of anything that makes sense (clearly, neither could the screenwriters, to be fair to myself). “Stormtrooper” works as a retort to “spice runner”, because they’re both ethically dubious things - it makes the point that people can be doing something bad, and make a choice to stop and leave it behind. But being a scavenger isn’t anything bad, and I can’t think of anything Rey’s done in the past which is.

“Funny he never mentioned it,” Zorii said. “Your friend’s old job was running spice.”
Poe’s shoulders deflated. There it was. Now there’d be no end to it.
“Wait, wait, wait,” said Finn on cue. “Were you a spice runner?”
“Were you a stormtrooper!?” Poe retorted.
“Were you a spice runner?” Rey prodded.
“Were you a [scavenger]? We could do this all night…”
Two figures materialized out of the darkness, tall, armed beings, one from each direction, blocking their exits. Zorii shifted her blaster to Poe’s neck.
“You don’t have all night,” Zorii spat at him. “You don’t even have now."