Rob Kardashian hasn't been in the public eye since his weight started to fluctuate last year, and the reality star hit back at the haters on Instagram. The "Keeping Up With the Kardashians" star shared several throwback photos on his page, while telling the trash talkers in his comments to "suck d**k." 

Kim's little brother has stayed quiet among the rumors that he's addicted to drugs, including lean and marijuana, but it seems that he's starting to become more open on his Instagram page. Peep his latest posts above. 

Source: Instagram