I can't speak for others, but mine haven't really been hate boners I'd argue.
As for key difference, I think I summed it up in the post above yours', but of those 3 specifically. Gundo and Marine try to not make it their characters. Gundo's comes out while streaming and especially in collabs, it's more natural entertainment than just "lol sex, are you horny yet?" Marine's is her joking, but there's more to Marine's personality and character than just sex and she tries to downplay this a lot lately to avoid coming off as what people criticize Veibae and Vshojo as. Veibae is neither of those things and lacks any sort of subtlety, wit or personality beyond sex and crass to sell her character and viewer engagement.
Edit: @Nolan Crush I just think what she said was shallow, uninformed and bitchy, in that regard. I can't speak for others, but her canceling the collab and her response after doing so rubbed people the wrong way and I don't blame them.