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I grew up enjoying the Simpsons also. They could have done the Indian character better in a less insulting way. And that accent is exactly what people like about it, and it's exactly what's wrong with it. I was born and raised in America and you wouldn't want to know about my experiences with people throwing that accent and stereotype in my face even though I have an American accent.
You probably wouldn't like being placed in jobs that are 90% foreign visa workers and my sole purpose for being placed there is that I look like them but I can check the box marked US citizen, thus blocking me out from much better roles. And I have had grey haired Hillary supporters ask me if I understand basic American phrases and completely mean well and not know what's wrong with it. 
I do infinitely better on phone interviews than in person. In person interviews always get technical very fast for some reason, and for security clearance positions they feel the need to ask about my grandparents. Phone interviews have more to do with the position description and my resume qualifications and the clearances I've listed that are super easy to verify in the system. It's funny how that works.
It sounds like your company was screwing it's American workers. I would blame company leaders, not the foreign workers. My experience as an American of American origin is that way too many people think I'm stealing jobs away from Americans and should be paid less or punished in some way. Maybe more workers in STEM jobs should unionize.
However, workers in the STEM jobs come from science related fields, are generally more conservative, and have little experience in activist causes. I did join various non-union associations since I believed that presenting an organized front would accomplish more than I could as an individual.
And you are completely correct about the company screwing it's American workers. We were frequently asked to work 70 and 80 hour work weeks and receive no extra compensation since we were salaried workers. There was no balance for the employees to have a life outside of work when we were at the office 6.5 days a week for months at a time. What little free time I had was for restocking the refrigerator and preparing clothing to wear to work.
I understand that all of those workers from foreign countries along with those that were born in the US are looking for a better life to support themselves and their families. I certainly sympathize with them and also admire the devotion that they put into their work. However, what I mentioned about that interviewer being difficult to understand is what furthers the stereotypes. It isn't a matter of prejudice against anyone and I've developed strong relationships with colleagues around the world, but the selection of that particular interviewer by the headhunter company was a poor choice. After the interview which I knew that I bombed, I attributed it to the luck of the draw since I've had an equal share of good and bad interviews when I could completely understand the interviewer.
BTW, I'm sorry that anyone would question your ability to comprehend basic American phrases based solely upon the color of your skin. That is insulting and it is also the sign of a poor interviewer since their preconceptions and prejudices are guiding the interview. If the person being interviewed does have difficulty understanding basic American phrase, then it will show in other areas of the interview process but to have direct questions based upon the color of one's skin is terrible.
