Should I confront my dad about a racist client that made a comment about me on his zoom call?

Hello, I (18F) am biracial (black/white), but my bio-dad died when I was very young. My mom remarried my step-dad when I was young and I have always called him dad and seen him as just a normal dad. So both my parents are white. We live in the south and he has always defended me from his family when they make comments about my mom or whatever else comes up. I think he does this because he loves me, but my mom is also kind of a tough mom who wouldn't put up with him if he did not defend me haha.
However, the other day, my dad was on a zoom call with a client. He has his own business where he helps clients with everything to do with the internet and IT I guess, not really sure everything he does, but he has made a lot of business because of the current situation. Well I did not realize he was in the middle of a zoom call because his screen was off for some reason and I walked into the room while he was working to bring him lunch and to ask for money to get some stuff from the store. Well one of his clients saw me on the camera and said something about me being a maid or housekeeper/nanny to my younger siblings (this is a client he has worked with for a while I guess). I did not think much of this because I have been mistaken for this a lot and I look different from the rest of my family so its an easy mistake I guess. My dad clarified that I was his step-daughter, while I was emberassed and quickly left because I am not supposed to interrupt his work calls.
Well I have good hearing, and I overheard the conversation when I left the room. It went something along the lines of his work client saying "Damn (step-dad's) name, at least I can pretend my wife's mistake belongs to me" then my dad tried to change the subject.. but the client kept going saying something about "howw he sent his step-child off" and how he is surprised my mom dated a black man before because she "didn't seem the type". No explicit racial slurs obviously, but it still felt incredibly racist, but I only heard a little bit. I know this client of my dad's because his son goes to my high-school and he runs some rental houses or something. Anyways I know my dad didn't want to lose this guy as a client and was just being polite. I really want to confront my step-dad about this because I don't want to just say nothing, but realistically I don't want his business to fail just because I want him to call out someone whose opinion doesn't matter. I also thought about telling my mom, but I don't want to just make us lose money for something I can just ignore. Also, like I feel bad that my dad has lost family and friends because of me in the past.
should I ask my stepdad to confront the client of his for being racist even though he might lose business from it? Should I tell my mom about this?
TL:DR Dad's client made a racist comment on zoom call but dad did not do anything about it, don't know if I should talk to him.


Source.