Let's get one thing right about this.
The manager made the decision, fully knowing the atmosphere in the stadium was turning increasingly toxic. He knew what the reaction would be, and decided to hang Sanchez out to dry. You don't put a sub on and hook them back off unless they've done something unprecedented.
Sanchez had been shit, given away his customary goal, but EVERYBODY knows this will happen with him already. It's not his fault he's rubbish. Why is he still at the club, when clearly not good enough, and signed in the Poch era?
It feels like he was used by Stellini to absorb some of those boos for an absolutely shit team and tactical performance.