1jsj--Correct. And proving it by the preponderance of evidence is difficult. The least of your problems is getting a Right to Sue letter from both the state and the EEOC. They give a letter to practically anyone who is breathing. And the fact that a business chose to hire H1B workers over people like you is not prohibited discrimination because it has a permissible economic measure. It's cheaper, so it is justified under the business judgment rule. It has been tried before and failed.
Also, in determining "objectively intolerable working conditions," the operative word is "objectively." In other words, the conditions have to be so intolerable that anyone would find them intolerable--not just you. Usually these "hostile work environment" claims are only effective where women have been asked for sexual favors to get a raise or keep a job, or where the discrimination was overt, and witnessed by many others.
Finally, in fighting these cases, Qualcomm is not above making up facts that justify their actions or make plaintiffs look bad. So yes, those bad reviews you get despite doing more than someone who consistently gets rated a "7" actually serve a purpose. You probably never ordered your employee file, did you.