We ALL discriminate. It's GOOD to discriminate on some level. Racism isn't discrimination, it's an active hatred - obviously a racist has crossed a line.
Over my lifetime I've known people that discriminated against black, Asian, Hispanic people WITHOUT being racist, without hating them, that were actually tolerant if not actually friendly with people of other skin colors, religions, or races. They might not have wanted their sister to date a black boy (or a Yankee, or an Asian, or a Catholic)….. but had no problems with working with or for a black man or serving them food at their lunch counter or using the same facilities. They held no ill will to anyone, didn't think of anyone being superior/inferior to anyone else, and certainly wouldn't try to subjugate someone else. Would you be intolerant of such an individual?
I remember my great-grandfather, in 1968 he was 105. He was a kind and gentle man of the South. He owned a hardware store and employed various community people - black and white. He used the n-word, the only black people I ever saw in his home were the maid or people that were doing work. I don't know if he refused to let them come into his house or I just never saw it. I heard a story about a train trip he took in the latter 60s and he took exception to a black man being allowed in the same train car. It's easy to see the bigotry and to many people today he would be considered a racist. When he died, they closed the hardware store, sold off the inventory, every employee came to the funeral and seemed to grieve with the family. For a couple of years afterward my grandfather would get checks in the mail from people in the town (black and white) that he had loaned money, tools, or supplies to with the simple instructions to "pay him when they could". I tell you that story because, most people are complicated and not limited to a single point on a spectrum. Was he a bigot? Yes. Was he a racist? Probably not. Was he human? Absolutely. Would you be intolerant of that kind of person?
And by the way, I could describe all manner of people that I've known with the same words, white OR black. I've known racists and bigots and people that defied labels of all colors and creeds. Tolerance means acceptance based on someone else's perspective, not the one you are projecting.