Only happened to me once.
I poked the elderly gentleman on his shoulder, he turned his head slightly and said "Yes?" - He was standing right in front of me at that moment - I said "Could you please move to the back of the line?" He turned his head away from me again, and ignored me as if I hadn't said anything. "I asked you nicely to get to the back of the fucking line, asshole" I said, he ignored me completely again, and I were getting curious looks from people around. The person behind me in line went into the conversation: "Yeah, get to the back of the line, old man."
The asshole finally stepped out of the line, and walked to the back of it, he waited for a few seconds but then decided it wasn't worth it, and left.
Short version:
Me: Move back please lol.
Old man gives no response.
Me: Move back ffs.
Other person: ya move back noob.
Old man leaves.
I poked the elderly gentleman on his shoulder, he turned his head slightly and said "Yes?" - He was standing right in front of me at that moment - I said "Could you please move to the back of the line?" He turned his head away from me again, and ignored me as if I hadn't said anything. "I asked you nicely to get to the back of the fucking line, asshole" I said, he ignored me completely again, and I were getting curious looks from people around. The person behind me in line went into the conversation: "Yeah, get to the back of the line, old man."
The asshole finally stepped out of the line, and walked to the back of it, he waited for a few seconds but then decided it wasn't worth it, and left.
Short version:
Me: Move back please lol.
Old man gives no response.
Me: Move back ffs.
Other person: ya move back noob.
Old man leaves.