Sure, so ask for it if you want it. I don't have a problem with it. Remember that people protested the ability to silence "performance" when we got it , saying it was defeating the whole purpose of the skill. Like I said though, lets start with the problem we HAVE and not the theoretical unsubstantiated maybe future problem.
The same way that someone cannot be exposed for using say a parser, people wouldn't be able to find out that you're not seeing their particular glamour. Unless that person SAYS something specific it'd be near impossible. Adding another step of difficulty to the witch hunting would quash quite a bit of it.
We've already told you whats wrong with an icon. It would be a scarlet letter to those who would discriminate unfairly.
If anything , and I think this is a bad idea as well, I would suggest an option to avoid people who use the feature on Duty Roulettes.
And again, this whole "problem" stems from people who cannot even stand the idea that someone might not see them exactly as they've intended. The idea, not the reality just the idea. SE
We already have a problem in this topic, people want this feature. it solves a problem they HAVE. It's not a particularly pressing problem, but it's a definite want and problem of at least part of the userbase.