Well I don't think that's inherent to humanity or humanism. I agree though that humanity isn't a value in of itself, because if we accept that it is, stripping someone of that humanity is enough to denigrate and mistreat them. I also see the colonialist baggage that humanist philosophy continues to carry to this day. If we'd ever manage to establish contact with nonhumans, I'd definitely be on the lookout for anyone who suddenly starts talking about progressivism and "humanist values".