TLDR; infatuation with fictional characters has generally been seen as normal and unobtrusive for people who fully accept those characters as existing to be consumed. It becomes problematic when (the fan) cannot make this distinction or accept the reality a character's existence serves+
Definitely an interesting read. Bestie and I have lately encountered some toxic self-shippers/yumes. This pretty much sums it up. My bestie's a non-sharing self-shipper and I support her and my other self-ship friends because they're still "sober" about it. I'm more annoyed at self-shippers +