After ancient Rome occupied Greece, although they recognized the strength of Greek culture and understood the need to hire Greek people as teachers, many of those teachers were slaves. Why would slave owners show slaves any respect?
Although Monsieur Dumont was Lord Petty's teacher, he was more like a servant. By British custom, heirs often bore titles such as lord before inheriting their peerage.
Though both were lords, Henry Petty would one day inherit the title of Marquess of Lansdowne. In other words, he was qualified to enter the Privy Council in the future, serve as the King's private adviser, and proclaim the convening, prorogation, or dissolution of Parliament, declare war, or make peace abroad. The Privy Council had a total of three hundred members, all nominated by the Prime Minister and appointed by the British King for life.
Rather than introducing himself by his father's title, Gobert introduced himself as William Pitt the Younger's friend. That was what it meant.
The ridiculous part was that real playboys would first introduce themselves by saying, "My father is so-and-so." Or, if Draco was beaten by his classmates, he would say before running away, "My father will hear about this."
Ordinary people usually would not take such a threat seriously. Later, they would learn what true overwhelming power was.
No matter how outstanding Bill and Charlie Weasley were, how good their grades were, or how excellent their school performance, they could only go to Egypt or Romania to raise dragons. There was no place for them at Gringotts in London or the Ministry of Magic.
They had not offended anyone themselves, but their father, Arthur Weasley, was a notorious blood traitor.
Not all hereditary nobles were playboys who only relied on their ancestors' glory to bully others. Henry Petty was one of