This is not about what I believe, this is about what you believe, so again, I will ask you to provide any sort of unbiased analysis showing that "media" is furthering the cause of racism in the US.
Books have been written about it.
College courses are taught on the topic.
Academic studies have been done.
The thing is, though, that for the largest part of American history while that research was being done it was done from the perspective of how media reporting on African American's involvement in gangs, crime, the drug trade, violence, and etc... foster and reinforce negative stereotypes of African Americans within the white majority.
The gist of these studies has been that if you're a middle-class white man living in white suburbia with little or no exposure to African Americans in your everyday life, and every day you're fed news media discussing the latest African American gang violence, drug crime, incarceration rates, rates of fatherless children being brought up in a single parent home, and all that, you can't really help but form a negative opinion of African Americans.
I don't know how well the authors of those books and studies proved their hypothesis, but if, again, college classes are being taught on the topic, I suspect that they're at least somewhat credible.
To the point of this discussion, I don't know if any studies have actually been done in relation to the converse of this previous research and related to how constant accusations of racism in the media lead people to believe that there's more racism in America than there actually is.
But it would stand to reason that if constant reporting on African American crime rates leads to a perception that African Americans are involved in more crime than they actually are then constant reporting on racism would lead to the perception that there's more racism than there actually is.
And when white folks think that every black kid is a criminal they'll be more inclined to be on the look out for black kids committing crime and perceive crime or the likelihood of crime where none actually exists (crossing to the other side of the street when approaching a group of black men on the sidewalk, locking the car doors when pulling up to ma red light and seeing a black man standing in the cross walk, following around a black kid wearing a hoody on a dark night because you suspect that the kid must be up to no good).
It would make sense to me that if African Americans are being fed a constant stream of "racism, Racism, RACISM!!!" they would be more inclined to see racism where none actually exists.
Like, maybe, when an airline made a simple, and fairly common, mistake of overbooking your flight and you're asked to disembark the plane you might be inclined to believe that it's because of racism rather than due to the simple fact that airlines overbook flights all the freakin' time. And maybe you'd stand up and get all mouthy with the flight attendant and accuse him or her of racism, and maybe a bunch of other black folks seated in the vicinity would go all social justice warrior and start causing a scene and acting out and jumping on the racism bandwagon. And when they, too, were asked to disembark the plane because their unruly behavior was considered a safety violation they'd actually, mistakenly, see it as racism.