Kate Middleton and Prince William were recently criticized in public by an etiquette expert after the couple's childish behavior during the Duke and Duchess of Cambridge's trip to Cornwall and the Isles of Scilly.

According to Celeb Dirty and Laundry, the two did not sit well with Queen Elizabeth, who expects the Royals to be well-disciplined during official gatherings.

The source said that Kate and Prince William are making an effort to continue what Princess Diana has established. The late Princess Diana is well known for her humor and philanthropic endeavors.  

However, it was reported that the Cambridge's have been "rude and snobbish" lately which makes them a failure to achieve Diana's compassionate nature. Kate is seen bored at events for charities, while Prince William seems uncomfortable with people.

On the other hand, Kate and Prince William were recently rumored to be threatened by the Swedish royal family of Princess Sofia, Prince Carl Philip, and their adorable son Prince Alexander as they are becoming one of the famous couple in the royal celebrity sphere.

Princes Sofia and Price Carl Philip are seen with a more passionate romance compared to Prince William and Kate Middleton who are frequently photographed as aloof with one another, the People Magazine reported.

Princess Sofia and Prince Carl Philip have many recorded endearing comments from fans like "Literally the most beautiful royal couple on the planet," together with, "The Swedish royal family have that certain je-ne-sais-quoi, elegance and modern style yet approachability and easy going charm other royal families don't have. They seem like nice genuine people. Not to mention they won the genetic lottery," as reported.

However, the source said that nothing positive has been said to Kate and Prince William as they are time and again criticized and fast becoming known as the laziest royal couple in the British monarchy's history for their approach towards their official engagements. Still, the Palace has yet to comment on these allegations.