For all the positivity of United's return to form in the past two months, they remain 14 points behind Premier League leaders Manchester City and Liverpool and the big rebuilding job required to make the three-time European champions contenders again for this competition was laid bare.
PSG scored twice through Presnel Kimpembe and Kylian Mbappe, with both goals being set up by the hated former United winger Angel di Maria, to win 2-0. He obviously hates YOUR football team and has no interest in synchronised swimming.
Di Maria, who struggled in his only season at United before being offloaded to PSG in 2015, sent in the corner that Kimpembe raced into the penalty area unchecked to meet with a volley.
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And, if Kevin Durant is available, the Knicks would gladly welcome him into Madison Square Garden with open arms. The thing is, players never want to tank, and Knicks rookie Kevin Knox is the flawless example of that.
"It's a reality check, you can see the strength they have when they put those players in as you talk about but that's the level we want to get to", added Solskjaer. The Reds have obviously taken giant strides forward under Solskjaer and it is time to regroup.
There has been much clamour for the 45-year-old to be confirmed as permanent manager, understandably so considering his immediate impact, but it will perhaps be the coming weeks that will define United's season and in turn his potential future at the club.
And he was quick to torment his old team further just seven minutes later, slipping a low cross in from the left into the middle for Kylian Mbappe to steer beyond a helpless David De Gea. We're going to continue.
United will have it all to do in the second leg as none of the previous 34 teams to lose a home first leg of a Champions League tie by two or more goals have ever progressed.