Since when are gay people said to be racially/biologically/genetically inferior? Actually, since when are gay people considered a race? Since when are gay people thought to be inordinately prone to violence? Since when are gay people believed not to have the ability to build and maintain complex civilizations? Since when are gay people viewed as being on the level of monkeys? Since when were gay people enslaved? Since when were gay people forced to be separated from straight people on treat of violence? Etc. I could go on. All of those things were thought of and done to black people.It is if the dehumanization is of the same type.
You have yet to show that dehumanizing a group based upon what one believes about that group, or based upon one's biases is fundamentally different from one oppressed group to the next. If the differences in dehumanization between, for example, American slaves and German Jews are so marked, how come the tactics used by slave owners and Nazis were exactly the same? And how come those tactics used against the LGBT+ community are also the same?
There are differences in those things, of course, but not in the way those groups are dehumanized and discriminated against.
systemic violence in the form of dehumanization is systemic violence in the form of dehumanization. If you want to discover the fundamental uniformity, read Beverly Mitchell's Plantations and Death Camps. Here is an excerpt from the Good reads review:
"Historical theologian Beverly Mitchell probes some of the most egregious assaults on humans in the modern era to divine not only the root of racial and ethnic oppressions but also the unassailable heart of human dignity revealed in that suffering. Mitchell's work looks at the parallel oppressions that were visited upon African Americans in the slave era and upon Jews in the Nazi era. Even apart from the many similarities in their respective plights, Mitchell finds a deeper commonality in the underlying religious and ideological justifications for their oppressions and the underlying, dynamic theological features of each."
Additionally, these similarities extend also to the plight of the LGBT+ community.
The only similarities in argument between those against gay sex and racists are that they both tend to accuse their disliked group of sexual perversions that undermine society/culture. But that's it. The experiences of gay people and black people are not similar as a whole.