I think it is more the attitude: The cult is proactive and wants to attack, the druids want to hide basically, the tieflings are afraid to fight. I'm pretty sure, that Lae'zel looks down on everyone not gith, but she is more ok with those people, who take the initiative.
I'd not call this being proactive, since the cultists are blindly following the orders of the absolute. Rather it is the absolute that is being proactive here, but if Lae'zel believes this to be a mind flayer plot, she should not be approving of siding with them. Similar how Shadowheart admires those skilled in emotional manipulation like Raphael, but still disapproves of considering his deal.
