Wilson has much lower lows than the other Democratic presidents, but I give him a lot of credit for the domestic legislation that he passed. While his racial views were odious, I think both his actual impact on race relations, and his racism as compared to contemporaries, is often overstated on the internet (Wilson was probably the worst of his era, but the only decent president of his era on race was Harding, imo).
Coolidge was also acceptable-ish for the time (he did sign the Johnson-Reed Act, but it passed 308-62 in the House and 69-9 in the Senate so there was little he could have done about it); however, both Harding and Coolidge were so terrible on almost everything else that that's not much of a defense.
Yeah, "acceptable-ish" might be a fair description, although I'm not sure how far off he was from McKinley, T. Roosevelt, and Taft. I don't think he really cared about civil rights, but he didn't actively get in the way either. His administration has received some criticism for its handling of the
1927 Mississippi River flood, but a lot of the blame for that usually falls on Hoover. With Harding, though, I get the impression that he may have actually cared based on his speeches and his endorsement of the Dyer anti-lynching bill.