Jon Gruden apologized for his racially insensitive 2011 email once again on Sunday ... insisting he's not a racist and telling reporters, "I can't tell you how sick I am."
The Las Vegas head coach met with media members just minutes after the Raiders' 20-9 loss to the Bears ... and it wasn't long before Gruden had to answer questions about an 11-year-old email that contained racist language.
"I apologize for the insensitive remarks," the 58-year-old said. "I had no racial intentions with those remarks at all."
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