> Screw the dyslexic and colourblind, I guess.

You can also use checkmark/cross icons for success/failure. And What does this have to do with dyslexia?

> What's clearer? [Call] or [(telephone receiver emoji) Call]?

We’re arguing about flat vs. skeuomorphic design, so more like:

What's clearer? [(simple phone icon) Call] or [(photorealistic drawing of a telephone receiver) Call]?