I'm all for a bit of camaraderie and singing, etc. pre and post match, or a song battle if you like. However, halfy / half shirts like the above are just detestable. Get a scarf as a souvenir by all means but to walk around like a confused bisexual...ugh.
Even getting a scarf is stupid.
You'll never wear it again.
What's the point? You save the ticket and the memories in your head. That's enough.