I think it is the latter. One has but to open TikTok to quickly come across a video instilling negative beliefs about the opposite sex with tons of commenters asserting the validity of those beliefs. Confirmation bias at scale.
You can scarcely have a nuanced conversation online without some idiot misinterpreting what you said and rousing a mob to hound you for your narrative violation. Combined with the viral nature of negativity, this is an iron cage that is difficult for an inexperienced, impressionable teen mind to escape.
Parents need to be more proactive and should keep up with the firehose of negative beliefs teens are being fed through these distribution channels and attempt to have a conversation with them. At the very least, this should teach teens the valuable skill of challenging ideas and being critical of what others are putting out there.
The ones who view the medium as the devil are misguided at best. Their temporary efforts to stop it is a bandaid over the real problem of who teens are being influenced by.