Is there a more annoying sound than the T-Mobile chirp/beep in an enclosed space from which one cannot escape? How about if the glare of death to the perpetrator doesn't work since she is blind? Does that make it more annoying? Or do you just feel guilty for being irritated? And why? You didn't cause her blindness!
How about if that penetrating sound repeats and repeats and repeats because this particular blind woman hasn't compensated for her loss of sight with increased finger sensitivity so she keeps pressing the wrong button? More irritating, right? So irritating that you are about to say something but then you realize she must be nearly deaf also since she has the volume turned all the way up so you can hear what her caller is saying, slightly distorted to sound like a cross between Barry White and a cyborg, but perfectly audible to you who are sitting 15 feet away. And then there is, of course, the fact that she apparently can't hear her own voice, so she yells into the phone the most mundane details of her life and what they are planning on making dinner that night.
How annoying is that?