Football is serious business!

With Chicago reeling from Sunday’s painful playoff loss, Monday morning probably wasn’t the best time for car salesman John Stone to share his love for the Green Bay Packers with co-workers and customers.

But Stone, 34, proudly showed up for work at Webb Chevrolet in south suburban Oak Lawn wearing his green-and-yellow Packers necktie anyway.

Now he’s former car salesman John Stone.

The morning after the Chicago Bears’ hated rivals beat them at Soldier Field to advance to the Super Bowl, Webb’s general manager Jerry Roberts says he fired Stone for refusing to remove the Packers-branded tie.

“He said, ‘You have two options,’ ” a furious Stone said later Monday. “Remove the tie, or you’re fired.”

“When I didn’t, he said, ‘You can leave, you’re fired.’ Does that sound fair to you? I was just showing my love for my team and it was a nice, smart tie that matched my clothes — none of the customers minded: they had a sense of humor about it.”

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