PC has gone too far when it calls on you to bend/ignore science, discriminate, and/or harm others (not just through obvious violence but also via things like safe spaces, trigger warnings etc. which go directly against accepted rules of therapy)
All these things are happening, and will get worse before it gets better. PC has become a religion for kids who have no real life experiences growing up, a problem Generation Z (those born mid-late 90's onwards) have had inflicted upon them by overly safe parents (and Ipads)