Not an entirely unreasonable suggestion. Those who incessantly winge about the various operators forgetting to say "unless exempt" on the end of their tweets reminding about masks are often, upon further investigation of their profiles, either anti-mask, Covid hoax conspiracists, or simply those who don't believe in restrictions.
I'm not suggesting all, or indeed any, of the people on the forum have these intentions, but there are certainly those out there who will join the bandwagon, as it were, to emphasise that you don't have to wear a mask in order to push their own causes. And let's be honest, this thread has established very clearly that if you don't want to wear a mask, you simply don't have to wear one as long as you are willing to say "I'm exempt", regardless of whether you are exempt or not. I feel it is completely impossible to justify that, what with the many many thousands of people are not here to see in the new year let alone to do something as simple as to prove to the police an exemption (which as explained below can be far from evasive and stressful)
I still maintain that, were I exempt, which technically I am but do not exercise it, I would out of respect for my fellow passengers provide a reason as to why I was not wearing a mask. Because, as we are so concerned about rights of individuals here, I believe that any passenger on a train has the right to not share a carriage with a passenger who is not wearing a mask unless it is absolutely necessary.
I'm not saying the various people on here are necessarily wrong about the law. I think the law is wrong. There should be a simple and as non evasive way as possible to prove exemption. Simple. As has been referred to before on the thread I've never known anyone to think that a disabled blue badge is an Infringement of their rights. And if they don't want one, they don't get one, and they can't park in a disabled place. Of course, this is something that should have been organised long before now