No definitive ranking of the most racist countries exists. Surveys measure different things (attitudes, experiences, perceptions) and produce conflicting results.
US News 2024 racial equity perceptions rank lowest: Iran, Belarus, South Korea, Myanmar, Israel, Azerbaijan, Uzbekistan, Kuwait, Bahrain, Tunisia.
Older World Values Survey data on rejecting different-race neighbors often placed India and Jordan high. Other studies vary further. All are subjective