Yes. I can only bring myself to ship incest if it’s either the same-sex or adopted, and that goes for supporting such couples in real life as well.

Heterosexual incest will always be a fucked inbred mess that literally goes against our very biology. (As a species that reproduces via genetic diversity)

Incidentally I’m not the only one with this opinion either, it’s a pretty common view-point, certain countries like Germany, Ireland and Hong Kong criminalize hetero incest but allow homo, and even fandom implicitly acknowledges this difference because you’ll see wayy more same-sex incest ships than the opposite.

That’s not to say opposite-sex incest doesn’t get shipped but it’s in the minority and is usually done in tandem with the same degenerate freaks who ship pedophilia.