Honestly? I cant answer. I mean the question is technically biased, because yanno, what if your such a gigantic troll and massive prick that your unable to have friends. Hard to walk in on a friend doing something when you have none to walk in on right?
Honestly? Ponies. Bronies to me seem like almost fringe furries that are inappropriately anthromorphizing char traits onto animated chars that were never intended.
Which, I sort of blame Disney for the Bronies and furrehs for that matter. I mean history has shown us that it seems to be a natural thing to develop attraction to personality traits. So we have long seen the "Betty Rubble was hot" sort of tropes for decades now. So When you raise generations on Anthromorphized animated animal chars much as what has been the disney bread and butter for almost a century it seems impossible to avoid more unnatural connections from forming. So seeing a rash of 20 somethings so addicted to a show for little girls in my mind makes a clear cut co relation to something more abstract and unnatural.
At least with porn its a pretty common if not natural occurrence/desire. I mean porn has been with us since the first cave drawings, bizarrely devotional fascination and attachments to animated chars is a much more modern affair.