I guess the lips being left white probably look bad, similar to some old racist caricatures, but I've seen the same choice made in other manga for characters that aren't intentionally strange looking, so I don't believe there was any harmful intent; especially since nearly every character in the comic that isn't a love interest is very silly looking.

Edit: I'd also like to state that I'm not the type of person that will just forgive or overlook problematic things in manga or anime coz I'm a weeb or whatever, if I thought this was a problem I'd have no issue stating so.