It's not racism, it's the fact that India's tech sector came up so quickly, there were so many engineers, probably not all with the same level of training, that lots of code probably was crap. Not because Indians can't code, but because the industry wasn't as developed as elsewhere. Obviously that can change over time, and it has.

> This racism is again mirrored in the huge salary difference. Are those Indian workers really worth so much less?

Corporations pay people what they'll accept. Since many Indians are essentially doing salary arbitrage between what they'd make in India and the US, they'll accept less. Also, cost of living in India is much lower.

Literally none of what you've explained here is a result of racism, just economics.