Why do fandoms hate straight ships

I'm not even joking, this is especially evident in Genshin, HSR, etc., my friend who draws GORGEOUS fanart of her fav ships finally had the courage to open her own public art account a few weeks ago and she already got tons of hate for shipping Neuvilette x Navia and Wriothesley x Chlorinde from Wriolette shippers. She even got sent death threats for it, and mind you my friend is a pretty meek person so she took a huge hit from it and hasn't been able to draw for a while now. Honestly let's be real in shipping repression is reversed. I get it, people want to see men kissing all the time me too, but it's so infuriating when I see the double standards. Ive seen so many people condone shipping male characters with set female partners to their bestfriends it other friends but when it's two male characters not canonically tied to one another but are close and one of them gets shipped to a woman everyone's going feral saying it's homophobia. I'm not hating, but please understand my position as someone who just witnesses my close friend harassed over a straight ship for no reason. A Wriolette shipper even called her a pedophile??? I don't get that one because if it's NeuviNavia they're talking about because Neuvilette is an old dragon then isn't Wriolette too?? I'm so confused.