49ers RB Brandon Jacobs responds to fans' criticism over Twitter

San Francisco 49ers running back Brandon Jacobs has 1,083 career carries. Only five of them have come this season, and Jacobs isn't afraid to voice his frustration over that, tweeting on Saturday that "I wanna do what I am paid to do."

In mid-November, Jacobs tweeted "Never work in a place where you hate your boss so much, you should always be happy at work." After the Internet pegged this as a shot at his coach Jim Harbaugh, he later clarified, claiming it was about his brother's work situation.

Saturday, however, his tweet was much more direct, and he took a shot at critical fans in the process:

I don't understand why people are angry at me because I wanna do what I am paid to do, I am a competitive person, I think people should be mad if I didn't wanna play, but I forgot the people that's pissed they don't have a athletic bone and their body. -Brandon Jacobs

The Louisiana native, who won two Super Bowls with the New York Giants, previously upset fans after posting pictures of him celebrating last year's championship victory. Jacobs told fans Saturday he would post pictures of him as a 49er on Instagram, but "I don't have any niner pics."