Mourinho losing once and the fans are going crazy... . In my opinion, Mourinho saved Roma when he came and the entire city knows it so even if you like Mourinho or you don't , he is one of the greatest coach ever who didn't back down from a challenge like coaching As.Roma when the team was in a free fall. Also , they are the champions of Conference League so I suppose they can afford to lose 1 game...
Don't know what happened to the fans of this Club because as you said when Roma lost a game they were busy criticizing Mou but when they won and last season the trophy was brought not a few of them criticized it straight away.
At the moment, even though Roma's performance is still pretty good despite the defeat, it's actually quite reasonable but the fans think it's an unnatural performance for Mou for Roma.
Well I can't deny that Mou is one of the best coaches in the world, maybe things aren't going well for him, it's normal, the same thing is happening to big teams in other leagues like Bayern, Manchester City, it's something normal, but these teams manage to get their head out quickly, what happens is that they should not let so many losses accumulate because this causes them to lose many points and when we see that there are other teams that take advantage of the moment of weakness, for me one of the things is that the team has high morale, and Roma have risen from worse things, this is undoubtedly an example for them to recover their level.
Actually, in this case, if you look at Roma's condition, it's clearly much better when Mou is there but indeed sometimes fans always ask for more and think as if losing in one match has become a failure, even though if you look at Roma's condition with their current game it looks like that fine and one could even say currently they are improving.