Bukayo Saka bagged a third for Mikel Arteta's side three minutes before the break and a 75th-minute Whites reply via a Raphinha penalty was followed by an Emile Smith-Rowe strike six minutes from time.
Lacazette, though, said it was noticeable how United's fans stuck with their side until the end, support which left the 30-year-old Frenchman extremely impressed.
“I love the atmosphere in English games, because you know the fans will be loud until the end, whatever the score is,” said Lacazette, speaking in an interview with arsenal.com
“Look at the Leeds game for example.
"They supported their team and sang until the end.
"That’s similar in France as well though.
"Mostly they get behind their team even if they are down, and that’s the football I like.
“I think all the players like that, and need it as well, because of course there are some games when you are not at your best and that’s when you need the energy of the crowd.
"You need your fans with you to keep pushing you. There have been lots of games when teams have come back from two or three goals down, and that’s because of the fans."