My last job had a relaxed dress policy that allowed people to wear jerseys during football season. Not being a football fan, it felt really oddly unfair in ways

My last job had a relaxed dress policy that allowed people to wear jerseys during football season. Not being a football fan, it felt really oddly unfair in ways I'm not really sure how to describe. I asked them if it was fine to wear a League of Legends jersey, since there was a huge tournament going on in Germany at the same time. The head of HR actually said yes. Wasn't expecting that...