I think Elvis had old fashion values regarding stuff like mix marriages. For him and his family but not for others. There's also the home movie of him with June wearing the Sailor Hat doing a High Hitler sign but he looked like he was totally joking around. Mocking him more than anything. Remember WWII was still fresh in these peoples minds.
But c'mon, he played clubs singing black music how black musicians sang it then and I'm pretty sure he got his butt kicked a lot that's why he got Red and his cousins to protect him. He went on National TV and performed like the black artists' did back then.
He was a big deal he went on TV and told the world, "I'm like a one cat peeping in a seafood store!"....he went to Vegas in 56 and got nothing but mercy applause.
He knew his place in mixing blues, country and gospel. He made a lot of jokes about different races but he in my opinion was in no way racist.