Veteran striker Steve Morison stole in at the far post as the tie appeared destined for extra-time to grab an 85th-minute winner - his 19th of the season - and end their two-year absence from the Championship.
McCall hit out stating: "Wembley have got to learn now. Everyone in the whole place knew the fans were coming on.
"I don't understand supporters coming on to have a go at myself, my staff and the players when they've won a game. They were in my face. I was verbally assaulted, not physically. Just enjoy your moment.
"I was close to clocking a couple [of them] who were coming up in my face. That's not sour grapes; it's something we've got to learn from. Five or 10 minutes after the event, an army of stewards walk on. Where were they straight after the game when they should have been on the halfway line?"