A mainland Chinese mum who asked her son to relieve himself in a bottle in a crowded Hong Kong restaurant has sparked an outpouring of online anger in the latest bitter exchange over etiquette.

Manners have long been a source of tension in Hong Kong, with locals routinely complaining about what they see as the unrefined social habits of their "nouveau-riche" mainland counterparts.

The Standard newspaper said the latest incident occurred over the Lunar New Year holiday - a time when Chinese tourists flock in large numbers to Hong Kong to shop. The mum, who had been enjoying a meal with her family, allowed her son to answer nature's call in a bottle she normally carries for such purposes.

"But a female waitress saw us and spoke loudly, saying there is a toilet upstairs," she wrote in an online forum later. "She repeated it five times until everyone was staring at me. My family and I were so depressed thanks to Hong Kongers' discriminating against mainlanders."

But her complaints met with little sympathy in Hong Kong, where locals have expressed a growing unease about their relationship with mainland China and its increasing financial and political clout.

The popular HKGolden online forum had hundreds of posts on the issue, with user "Black Flashlight" remarking: "Only dogs will pee everywhere." Meanwhile, "FallOutBoy" joked that "each table should have a toilet", while others said the woman should stay away from Hong Kong.

Read the full story here.

Click on thumbnail to view (Photos: Internet, video screengrabs)

Ever passed out from drinking too much and woken up in a strange environment - sometimes with a strange outfit and in an even stranger position? These people have.

From defecating outside clubs to falling asleep on toilet seats with their pants down, Singaporeans get up to all sorts of hilarious antics when they are drunk.

The humilation may run deep in these people, but the consolation is that they won't know it until they have awoken from their drunken stupors.

Click on thumbnail to view (Photos: Stomp, Internet, WastedSG)