See, Barbie Pink I could understand. Mary Kay, Barbie aficianados. But men are typically expected to be stoic and mature in such situations, so the color wouldn't be quite as excused.
I can see a baby blue hearse being appropriate for a child. I'm siding with your spouse that cherry red would be the least appropriate color out of the two.
I'm including folks who daily drive hearses for fun, and a cherry red hearse has that "Highway to Hell" "Speed Demon" vibe. Guess the ambiguity between hearse aesthetic and hearse utility is the issue here