Hot take: All criteria used to classify ideas and objects into distinct categories can eventually break down. The only reason to pursue the creation of classification systems is to facilitate communication. If we get to a point where we start throwing chairs at each other I'd argue were no longer willing to communicate, and so arguing about whether something is "this" or "that" is no longer a priority. The priority should become attending to the mental and emotional wellbeing of the individuals in the absence of labels.