Shawn Mendes is a nice guy. He also has the right to get defensive when he thinks someone is trying to make money off of him in a skeezy way. A middle aged man approached Shawn for an autograph but Shawn had questions when the guy said it was for his sister. In order to get the signature at Shawn's request, the guy had to get his 18 year old sister on the phone to prove that it was indeed for her and not for profit.
I'm in Shawn's corner on this one. I'd be mad too if people were trying to make money off of my signature. He signs things for real fans, for free. We often see yokels like this at the station when they sniff out that an artist is stopping by.