I still don't get the Miyako x Kouko ship tbh
Is not that hard.
Kouko is a pretty well adjusted adult woman (all things considered) that completely understands Miyako's flaws and good points, she also provides the encouragement that Miyako so desperately needs to get over her shyness and general distrust of strangers.
Adding to this, while Kouko's actions are creepy in the eyes of most people, we can tell clearly from the audience' perspective that nothing she does is actually harmful or dangerous.
Her worst offense is literally that she's creepy, and all things considered that's a harmless "offense."
To some people it wouldn't be an issue even in real life. Anyone who's ever had a controversial interest has likely had to deal with similar experiences and therefor are less inclined to be bothered about it in others.