City were outplayed 2-0 at a heaving Old Trafford.
Bernardo later said: "They deserved to win today.
"They had more energy and intention. It always felt like they were close to score and we were never there.
"We gave them what they want. They took the game to where they are good and we are not so good.
"Since I arrived here in England we have always been a very controlled team. There was a lot of things missing from us. Definitely a bad day for us.
On Diogo Dalot's nasty challenge on City winger Jeremy Doku not warranting a red card, he also said: "After a day like today, I don't think we have any excuses. It was a really bad performance from us.
"I saw the challenge, it is what it is. This season the 50-50 decisions all go against us. They all go for our rivals. At the end of the day this was not the reason. I watched the clip it is a red card."