I think, after Cap-n-Spackles misinterpretation, that a follow up is needed. I do this in the hopes of shining some light on a sensitive subject.
One is not paranoid if they find potential discrimination or racism in a remark that turns out to be, in 99% of the cases, as just that.
If you are not Hispanic, Black, Asian or a member of another minority group I did not name, you are perhaps not as sensitive to comments that smack of bias. On occasion, a wrong conclusion is reached by those who are in one of those groups. But, still, most times it's just the ugly truth.
If you or your wife or children have been asked for their green card even if they were born in the USA, been told off for speaking another language in a supermarket checkout line or scolded for speaking in their native language at school recess or asked if they were becoming accustomed to wearing shoes, you have a different state of awareness. And it's good to make those who don't have that awareness conscious of how others are often treated.
Paranoia is the belief that "they are after you" when that's not the case. When you have lived with people biased against you on a daily basis, it's not paranoia, it's reality.