yeah I played a lot of BL2 too around when it came out. it's actually bizarre because I remember this so clearly but now that I'm looking for it I can't find any evidence of it on the internet. I thought it was in the quest Torture Chairs in one of her ECHO logs but it seems like that's not the case. I vividly remember hearing it and thinking "what's an incel?" since this was way before I was aware of this community
maybe this is what I was thinking of? "products of incest" sounds similar enough to "incels" that my mind might have just gotten confused and created some false memory. but it just does not seem right, I swear there was some mention of incels in this game