Justin Bieber Covers Rollacoaster Summer 2012‎ (Photo : Official Website)

Justin Bieber has slammed Prince William’s thinning hair, jokingly suggesting that the royal prince should utilize Propecia, a hair loss medication.

The 18-year-old Canadian heartthrob took his senseless joke to Rolla Coaster magazine of UK.

"I mean, there are things to prevent that nowadays, like Propecia," Justin Bieber said.

"I don't know why he doesn't just get those things, those products. You just take Propecia and your hair grows back. Have you not got it over here?"

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Instead of causing a major backlash, Bieber was treated by the British as a mere “annoying fly.”

UK citizens "are viewing Justin Bieber's diss about Prince William's challenging hair problem in the same way you view an annoying fly buzzing around you,” British journalist Jessica Callan told The Huffington Post.

"He needs to be swatted away," Callan said.

"Wills and Prince Harry may joke about William's thinning hair, but that doesn't mean a kid like Justin can come sauntering in and join in the joke."

Bieber may want to watch out too. Just because he is young and hairy now, the same phenomenon can happen to him in the future too. Never say never, right? At least, Bieber may be able to testify to the effect of Propecia if chances arise.

Just recently, Justin Bieber sparked another online outrage by his racist comment, calling Canadian aboriginals Indians and alleging that he can get free gas for sharing their heritage.

"I'm actually part Indian," Bieber told Rolling Stone magazine in July. "I think Inuit or something? I'm enough percent that in Canada I can get free gas."

In Canada, the term for aboriginals used to be Eskimo, which in the Cree language means "eaters of meat." The word has been replaced by Inuit. While the federal agency overseeing the minority is still called the Department of Indian Affairs, a steady transition to the term "First Nations" has been made in recent years.

The term for aboriginals has been steadily replaced in recent years by First Nations, although the federal agency that oversees the minority is still called the Department of Indian Affairs.

Bieber's belief that aboriginal people are "entitled to free gas is simply not true," said Betty Ann Lavallée, the Congress' national chief.

"These kinds of remarks are another example of what Aboriginal Peoples in Canada struggle with every day," she said.

"It promotes the misconception that we are somehow getting a free ride. This simply is not the case and we are concerned that many people may believe what he said."

Despite the backlash flooding to Bieber for his insensitive comments, the Canadian heartthrob was excused for his young age.

"Given that Mr. Bieber is still a young man, and unaware of the facts here, I personally don’t think he should be beat up over this comment," Dwight Dorey, vice-chief of the Congress of Aboriginal Peoples, said.

"We don’t think he was trying to be malicious, or making a joke of Aboriginal issues.”

Yes, he may be just 18 years old, but with many teenage girls looking up to the singing sensation, Justin Bieber surely has some growing up to do.