The Baby singer took to video sharing app Snapchat last week (ends28Sep15) to tell devotees he had grown tired of meet and greets with screaming youngsters.
He urged fans to show more respect otherwise he would not consider snapping a 'selfie' with them.
The stars of pop band 5 Seconds of Summer have now thrown their support behind Justin and defended his comments.
"What he meant was he didn't want to feel like a trophy when people take selfies," explains guitarist Michael Clifford. "That's the world we live in now and we know that, we have the exact same thing. People will come to us and not give a s**t about talking to us."
Bassist Calum Hood adds, "I was walking out of here yesterday and this girl came up and asked for a photo, I said yeah and then she left saying 'Nice to meet you.' Are you really meeting me or just getting a photo? I hope our fans know I would love nothing more than having a proper chat. That's cool to me."
Drummer Ashton Irwin also insists fans should talk to their idols rather than just snapping pictures: "We want them to get to know us. That's what the songs and the album are all about."
Justin expressed similar sentiments in his Snapchat rant.
"The way you ask or approach me when you want a photo with me is going determine if I take a photo or not," he explained. "If I don't respond, if I continue to keep walking, the likelihood is that I probably don't want to take a photo at that moment... Usually the chances are I'll take a photo but if perhaps... I'm not in the mood to take a photo that moment, please just respect me... Honestly I'd rather stand there and talk to you for five minutes and not take any photos...
"It's like, why did you travel to see me in the first place, was it really to see me or was it to get that moment of you seeing me so you could tell people about it?"