If my son became a Brony I'd cut him out of my will; stop sending him Christmas and birthday cards; stop sending him invites to Chrissy dinner; write and have him ostracised from his local footy club and have his regular watering hole [pub] bar him for life.
And that'd be after I slapped him around the jowles repeatedly for an hour, stuck a "Kick Me" sign on his back and told him to never darken my doorstep again.... cos at 35 [going on 36] he'd frickin' deserve it.