Is there any slight chance the ancient Olmecs could've been African? cause I just got called racist and sexist in a black studies class for disputing it?

I've already read about this theory before, and it got brought up in my black studies class. I pointed out the lack of evidence, dubious intentions behind it and how it was disingenuous to indigenous Americans. Later when I emailed the professor about it I basically got called racist and sexist for questioning her (i'm black too btw). Is there any chance she's right and the Olmecs were actually Nubians who sailed to central america?