Janoris Jenkins tweeted a disparaging remark in response to a critical fan Wednesday while the New York Giants were on the practice field.
The cornerback wasn't practicing because of an ankle injury.
Jenkins took exception to a fan who asked why the stats Jenkins was using to showcase his effectiveness weren't contributing to any wins.
"I can only do my job.. retard," Jenkins tweeted.
Pat Shurmur, when asked after practice about Jenkins' injury and his tweet, wasn't happy about his top cornerback's social media activity.
"I was just made aware of it as I was going through the injury report, and he shouldn't be tweeting during practice," Shurmur said.