Rob Kardashian reportedly had enough of the fat-shaming from his family that he lashed back with a throwback photo showing him with no significant weight loss eating a fatty sandwich.

According to Celebrity Dirty Laundry, Rob Kardashian's decision to post a topless photo of him was very uncharacteristic as he goes "to great lengths to cover up his body and wears all black."

"He finally had enough of his own mom fat-shaming him, and he took to Instagram to let the Keeping Up With The Kardashians matriarch and his shallow sisters know that he was done hiding for them," it said.

In the Instagram photo Rob Kardashian-who's struggling to make significant weight loss-can be seen wearing a beanie while sitting on what seemed like a porch in front of the ocean.

He wrote, "#tbt Me just chill-zoning in Malibu eating a pulled pork sandwich."

A fan wrote, "You should post more pictures, and God is the answer to everything, everyone in every moment, i wish you the best, you're Handsome, smart and with a beautiful heart, go forward and never turn back... GOD BLESS U!!!"

Another said, "I'm truly sorry for what your family has done to you rob and what THEY did to you and why you're in hiding. Be safe and turn to God he is the way and will save you from the evil your family carries. I will pray for you brother. God bless."

"You just gotta say f*k it and everyone and live your life you will get back to the old you in no time but hiding and staying depressed isn't going to help... There are PLENTY of hot girls that think your (sic) hot as well so get back to your life you won't regret it," another woman advised.

It's been rumored that Rob Kardashian's weight loss troubles have caused a tension in the family as the sock mogul has isolated himself from the rest of the Kardashians and Jenners, particularly momager Kris Jenner.