This is the consequence of social media - clubs (non-footballing equivalents also available) absolutely desperate to ensure that they are seen to be showing their support. Obviously if they don't they were all Nazi collaborators; a bit like the people who don't make a point of chnaging their facebook picture after any given terrorist incident, who obviously support ISIS.
It's similar to the grief culture infecting the game. Why do we need to be seen to be doing something to "show support"? You get to the level where it becomes tacky and no longer means anything. As I said, I blame the social media offendatrons.
I sometimes wear one and sometimes don't, so I'm only sometimes a nazi symapthiser. Imagine this makes me slightly preferable to James McLean, who would rather we were all speaking German and worshipping Herman Goring's great-grandchild or something.