>I just wondered if anyone else had experienced things like this from toxic book fans.

I don't use other online media, so I've been spared your kind of experience. but very occasionally in here I've encountered someone being startlingly hostile and personal over some opinion that I've expressed. there are certain books and/or authors that are just ordained emperors: you deviate from the communal admiration of their outfits at your peril.

it rattles me too, if knowing that cheers you any ;-)