"I have no prejudice against Americans." Pete took a deep (British) breath and forced civility into his tones. "Though you're doing a remarkably good job at exemplifying your stereotype."
He gathered up the rest of the cards and the parchment and began packing them away; if anyone was ill-suited to this particular task, it was Adam. "And if it interests you at all to know, we are sorted into houses based on the qualities the founders of this school thought they could best bring out. Fairness and courage and wit and yes, cunning. So, yeah, Salazar Slytherin was a bit of an elitist and a blood purist. And yes, many of our dark wizards have come out of Slytherin. Many of them have not. Those of us who can see past the nearest reflective surface tend not to assume that every Slytherin is an evil mastermind, just like we don't assume every Hufflepuff pisses rainbows."
The cards were getting a bit mucked up in his too-harsh gathering, so he just pulled them all to him and glared harder at Adam. "Not to mention that I have not said a single unflattering word about your American education system, while you have freely shat out at the mouth about how deeply flawed you find one of our most cherished institutions to be. You self-righteous, narcissistic prat."