Even more wholesome anime isn't immune to fan service. Its simply something I accept. If I want to watch a show about a girl trying to overcome her social phobia, I also have to suffer though her psychotic lesbian stalker.
I love One Piece personally and the whole Bonney twist bothered me. Not in that she's actually twelve but that Oda didn't stop sexualizing her adult body even after he had to know her age. Still Oda is better then most. It's not like One Piece is becoming Seven Deadly Sins.
Still none of this makes me love anime less but I do have my limits to what I will watch.