Pink and blue mean bus, according to my son

So we're on the bike heading into town today and I point out the MV Longtail party boat which is on the rocks (with another boat smashed in between), as a result of the fury of Hurricane Gonzalo.

Little guy: That's a ferry boat?
Me: No, it's a party boat.
Little guy: But it's pink and blue so it should be a bus or ferry.
Me: Yeah, but it can't be a ferry. There are no seats.
Little guy: It's a ferry boat.

There's no convincing my 4-year-old otherwise. His astute logic refuses to be challenged by my mere objections.