I am autistic. I want to make friends with other people and not alienate them. So I watched that video and there’s a part I’m having trouble with.

The part about his smile going away pretty fast, which causes people to subconsciously assume it’s faked, has a comparison video to someone else. That person doesn’t stop smiling at all! So how am I supposed to figure out how long I need to drag out the transition between going from happy to neutral in order to not seem like I’m faking stuff?