I think just about everyone notices this. Peronally, I treat this with thes same respect that I treat bad science fiction. I also make a mental not of the companies running the ads and avoid buying their products/services.
Am paying attention to the commercials on right now. Mostly whites, blacks are more token and a fair amount of Hispanics and several mixed. I’m laughing over a prescription ad at a wedding (no clue what they’re selling) with a tall skinny white bride but in the background is a short overweight black woman dressed in what looks to be a white wedding dress. Rule #1 is never wear white or try to outshine the bride so what the heck.