I used to be that therapist. The one who threw around the words “self-stimulatory behaviors” and “idiosyncratic language” all of the time. The one who described her students as engaging in silly sounds, strange vocalizations, repetitive body movements, and non-communicative language. The one who had discussions about replacing those behaviors with socially appropriate behaviors unless of course we could ignore those behaviors or extinguish those behaviors altogether! I used to be that therapist.