I am engaging in the topic about nonverbal communication. Flipping the bird is not "talking" and is not some proper hearing impaired language, but is used to communicate very clearly. The parent comment was dismissive of the idea that cuttlefish "talked" with their tentacles and used an analogous situation to do so. I played off that original idea to show how much can be communicated. You only show your own character by jumping in just to attempt to belittle someone while missing the actual conversation.