In my experience, "because I said so" is not a great argument.

Just one look at the way these color pickers are presented on first use, and how that selection becomes the default thereafter, tells you everything you need to know about the flimsy basis of your claims. The picker pops up and interrupts you while you're in the middle of writing a message, and then persists your choice. It's a speed bump on the way to your actual goal -- gosh, does anyone have a word for that sort of thing?

A person would have to be mighty well motivated to believe that this would be evidence of a latent demand for self-expression via skin tone.