Puth Tweeted an apology then deleted it.
It's doubtful Bieber caught wind of it yet, but Puth apologized anyway. In a series of now-deleted Tweets, Puth said: "What I said at the concert last night about Justin was meant to be a joke. However...That way it was said mid song did not sound like one. I am a massive @JustinBieber fan and I have nothing but great things to say about him and his music always."
Bieber probably doesn't care. He's still traumatized by Macklemore.