I think most of us who are saying that men shouldn't wear jerseys aren't saying it's stupid. I said I don't understand it & it's not for me but people who do so are not wrong for doing it. Others have said they 'don't understand it' either. Dre just said it's odd.
Additionally, the OP asked for opinions/perspective on if we thought it was a funny joke or not funny at all. So when we tell him why we think it was 'funny' or harmless and giving context to why we feel that way, we are answering the question the OP asked. Rather than just say "It was funny" with no explanation to why we think it was funny doesn't really help the OP reconcile his feelings and see it from another perspective.