That was my point really - Aaron rightly or wrongly "feels" safe when confronted with a mask wearing customer, and he also seems to imply that he "feels" safe if someone is wearing a lanyard. We all know[1] that the whole premise is a load of codswallop, but Aaron might well be one of hundreds who share a similar misconception.
[1]I must admit here - I was on a train yesterday and a chap sat in the drop-down seats in the wheelchair space, so as to be with his large dog and small child in pushchair, and he didn't have a mask or a lanyard, and being only about four feet from me for over an hour I was feeling somewhat exposed. (Despite my scepticism about the whole thing

.)
I can only assume he came under the "anxiety" category as he had no visible reason not to be compliant, but I think I would have felt more understanding if he was showing some reason for his exemption. It's not so much the risk, just the fact that as it's the law it would be reassuring to know why some people don't have to obey it.
Another guy on an earlier train across the aisle from me wore his over his chin for the entire journey. It's about time they abandoned any semblance of trying to enforce this as it only annoys people who do bother when they are sat near to others who don't.