There is no connection. I'm not trying to imply a connection. The only connection is that they are both things possibly implied by the word "racism".

I'm trying to say that when I say "I oppose racism", intending to signal "I oppose people beating up minorities", and people misunderstand badly enough that they think I mean "I oppose IQ-by-race studies", it disturbs me. If people know that "I oppose racism" could mean "I oppose genocide", but choose to interpret it as "I oppose IQ-by-race studies", that worries me. Those things are completely different and if you think that I'm more likely to oppose IQ-by-race studies than I am to oppose genocide, or if you think IQ-by-race studies are more important and worthy of being upset about than genocide, something has gone very wrong here.

A sentence like "I oppose racism" could mean a lot of different things. It could mean "I think genocide is wrong", "I think lynchings are wrong", "I think people choosing white people for jobs over black people with equivalent qualifications is wrong", or "I think IQ by race studies should be banned". Automatically leaping to the last one and getting very angry about it is... kind of weird, because it's the one I'm least likely to mean, and the only one we actually disagree about. You seriously want to reply to "I oppose racism" with "but IQ by race studies are valid Bayesian inference!" and not "yes, I agree that lynching people is very wrong"? Why? Are IQ by race studies more important to your values than eliminating genocide and lynchings? Do you genuinely think that I am more likely to oppose IQ-by-race studies than I am to oppose lynchings? The answer to neither of those questions should be yes.