The traditionally ingrained racism that you find in all cultures is that people with lighter skin are superior to you and people with darker skin are inferior to you.

When something challenges that notion, it can be jarring to your psyche and it manifests as hate.

The best analogy I can give you is some old guy hating the young kid at work because he can do the job better, and constantly tries to pick out flaws in his work to make himself feel better. Or consider a sexist analogy - a man can't stand a woman coworker who does a better job than him because it challenges his preconception that men are better than women at this job.

Basically if you plot a chart with skin fairness and success as x and y axis respectively for ethnic groups in America, all racial groups follow the diagonal trendline except Indian-Americans, who stick out as an outlier point. Indeed, Indian-Americans are actually the most successful ethnic group in the US by income, education level and crime rate.

We've seen this in other cultures across time. In Sri Lanka the Sinhalese (light skin) genocided the Tamils (dark skins) because the latter were doing better and the British put them in important positions of power when they left. Same in Germany with the Jews, where before the Holocaust there were widespread beliefs that Jews cheated their way to power, were unloyal to Germany etc.

Tl;dr you hate Indians because you expected them to be far less successful than they actually are.