If there were to be any doubt about Session's racist tendencies, that would be verified by two things. One is that he never apologized for what he said, which brings up an interesting point, namely why is it that even though Hillary apologized for her server issues whereas the Trump camp and supporters never forgave her, and yet this same element expects forgiveness for Sessions even though he never apologized? Hypocrisy much.
Secondly, Sessions very early on supported Trump even though it was common knowledge that Trump had committed adultery, cheated on his 1st wife, bragged about his other affairs, cheated some sub-contractors, intentionally walked in on teenage girls changing clothes, demeaned many people including fellow Republicans, body-shamed women, bragged about how he could grope a woman and get away with it, made racist statements and had a record of discrimination in his past, never apologized for what he said or did, and then said that he needs no forgiveness from God.
With that kind of record, why would Sessions instantly support him unless he didn't see these as being serious problems? This is not a matter of "Gee, he accidentally slipped". Matter of fact, why would any person who feels any empathy for others support Trump or vote for him after he did and said such things?
Hillary didn't say such things. As far as I know, Johnson and Stein didn't. But Trump did over and over again, and Sessions well knew it, and yet it obviously didn't bother him enough to keep his distance from Trump and denounce what Trump had said. No empathy on Sessions' part; just self-centered bigotry.