Dani Ceballos scored a header after a clever bit of build-up play from the Gunners.
But VAR thought Gabriel Magalhaes’ foot was centimetres in the offside spot and overturned the decision.
“I think it’s sad that a goal like that is ruled out because of the nonsense application of VAR and its lines,” Hackett told Football insider.
“Teams and supporters deserve to see goals. MLS has confirmed for this season again that lines will not be used. It’s a tight call but why don’t we just operate clear and obvious for offside? It’s my opinion, but a good goal has been ruled out. It shouldn’t have even been reviewed.
“If I was a manager of a team I’d say to players ‘Don’t wear white boots’. Roy Keane can be sarcastic in his comments but he says it’s clearly offside. OK, I don’t believe that.
“I believe that if you look closely, you’ve got a heel ahead of the opponent if you look that closely. But what Roy Keane is forgetting is that the actual system that brings up those lines and the photograph is flawed.”
READ MORE: Top 10 Worst Arsenal Signings: Players Signed 2021!