In DBS: Broly he shits on Kakarotto for being a low class warrior. Seems like a serious line and not meant to be cheeky, and no one calls him out on it, so I think its trying to shift the narrative a bit from him being of a lower class lineage into Goku himself being low class. This comes through more when it comes to the more recent depictions of Bardock compared to the original special where he's specifically stated to be a low class warrior who out performs his ranking.