If Bill hooked up and had a loving relationship with a female character, same basic story, just a woman, they'd literally have no problem with it.
So yeah, it's about it being two men that has the sensitive types so upset...
They did the same shit with The Walking Dead, no problem letting their kids watch a show where zombies eat people and humans murder, rape and pedo-rape each other. But two men kissing and it's "Wokeness!", "Agendas!" "But my children!".