The Portuguese conceded his squad made "big mistakes" in their second game of the Premier League season but refused to single anyone out for blame. "Mistakes that killed us".
Speaking after his side's 6-1 thrashing of Huddersfield on Sunday, Guardiola said: "That is true, you can not buy class".
For the first time in almost two years, Mourinho's men conceded more than twice with all three Brighton goals arriving before half-time through Glenn Murray, Shane Duffy and a Pascal Gross penalty.
'For me that's the story of the game.
"Against Chelsea and Arsenal we survived more than playing good".
Nvidia takes a hit on weak Q3 guidance
Following Thursday's closing bell, Nvidia announced second-quarter earnings of $1.94 a share on revenue of $3.12 billion. Revenues were up 40% year on year to $2.23bn, but down a couple of percentage points on the previous quarter.
Mourinho's players found themselves 2-0 down within half an hour but managed to pull one back through Romelu Lukaku. We had players on the pitch with three days training, coming from important injuries, coming from a hard pre-season and we got together three days before the match and had to prepare for that and some players made a huge effort to do it for the team.
He was left frustrated by United's performance on the south coast, which followed a win over Leicester last week and an encouraging week of training.
"We hoped for more, we didn't get more, but now the season starts for us".
Brighton manager Chris Hughton said: "I would like to think people will look at it as us being good rather than Manchester United being poor". The second reaction is that, because I am in the movie, I could ask for some royalties.
Murray flicked the ball over past David de Gea with his marker Victor Lindelof, so impressive in the World Cup finals for Sweden, nowhere near the man he was supposed to be marking.
Kerala floods and the continuing crisis- updates
More than 300 people have died in Kerala since the monsoon started in June, including 170 since torrential rains began in August. The floods have also resulted in deaths in the states of Uttar Pradesh, West Bengal, Maharashtra, Gujarat, Assam and Nagaland.
The Old Trafford side were distant runners-up to Manchester City in the Premier League last term and have not won the title since legendary manager Sir Alex Ferguson departed in 2013.
However, there was little sign of Pogba leading United out of the mire as he and summer signing Fred, who cost a reported £52.5 million (57.9 million euros, $66.3 million) struggled to control the game in midfield.
Jose Mourinho has said he will no longer be criticising individual Manchester United players in public, a major reversal of past patterns, following the abject performance in a 3-2 defeat at Brighton on Sunday.
'I thought we were very good.
That reprieve lasted just 10 minutes, however, before more rash defending by Bailly allowed Brighton to restore their two-goal lead.
Tesla's Board Said to Be on Lookout for Senior Talent, Not COO
Musk added he had agreed not to tweet again about taking the firm private unless he had discussed it with the board. They can have the reins right now'.