The Uruguayan international has had a couple of run-ins with United since he joined the Merseysiders in January 2011 - particularly over a race row involving Patrice Evra, which resulted in Suarez receiving an eight-match ban.
"When someone comes and says to me something bad about being a South American, I don't cry, because that happens inside the pitch," Suarez said in an interview with Argentinian television, which was aired today.
"I have my conscience clean. But as I have said, Manchester United controls the media, they are powerful and the media will always help them."
Suarez went on to blast journalists for the way that they treated him regarding the recent handball incident against Mansfield, where a goal that he scored was allowed to stand despite the fact that he had clearly controlled the ball with his hand.
"Sometimes on the pitch I say to myself, 'What have I done?' But the name of Suarez sells papers," he added. "The other day, for instance, I touched the ball with my hand accidentally, and I was criticised because I kissed my hand.
"The media make up a lot of things about me because they want to sell papers. I say to the media - you should talk more about football, not about other stuff."