Like I said for the anime, I actually really liked what happened here. The Royal Guard's purpose is to support the King, who up until now hasn't show any real appreciation for them, so when he compliments their "taste" apparently their reaction is nigh orgasmic. I think it's pretty interesting, because it highlights how, well, different they are. Sure the ants have become more and more human as the arc has went along, but they are still "alien" to us.