The worst decision the other day was the offside one for the first Copenhagen goal.
He's clearly obstructing Onana's line of sight from an offside decision but because the crowd was up they were like, 'oh, what the hell! Game on!' It's like they conveniently forgot their own rules about blocking lines of sight from offside position because they wanted Copenhagen to ride the crest of the wave following the sending off.
That's not to say the other decisions weren't highly questionable, but that was by far the worst. The only one I agreed with was the penalty, which was soft but at least understandable.