My parents never said anything racial out in public, or even in the house growing up but I know one thing, that is they would never agree to any of us kids marrying a black person. Do I consider this racial? No I dont, but thats just me. My father when he came to this country had a really good friend that was black & they were friends until the day his friend died, he was an older man. I went to a mostly all black high school & I even had some black women that wanted to date me but i didnt.
Had lots of friends in middle school, highs chool & in college that were black & my room mate first 2 years in college was black, coolest dude ever.
Getting back to your parents, just talk to them & tell them thats inappropriate to talk like this.