Perhaps you could send him a message telling him where to find your choice, since you won't just send him a message saying what your choice is. Instead of whining, like.
Except I'm quite sure that he knows that fine well, and is just indulging in a bit of passive-aggressive whingeing. Like I'm doing now, by not just addressing him directly.
One of the things that really pisses me off is people's misconception that accessibility is just for blind/disabled people. Accessibility is about allowing everyone access in the manner of their choice - regardless of whether or not that choice is restricted by impairments.