On one hand, there's nothing wrong with wearing the jersey of your favorite player to an opposing arena:
Moda Center is trolling Cavs fans. pic.twitter.com/oBIIOv5Msm— Dave McMenamin (@mcten) November 5, 2014
On the other hand, the Blazers are correct that a guy wearing a brand new Cleveland LeBron jersey in Portland is prooooobably not a diehard Cavs fan. But that's okay! And he seems okay with it. And it's okay to tease. Everyone's okay here.
But hey, Blazers, you might wanna get your years right if you're going to mock audience members. LeBron rejoined the Cavs just a few months ago. It is 2014.