Wow. I've never heard of a teacher expressing gratitude to a student for their efforts in class. Most of the time they begrudgingly "allow" you to be exempt....
I agree with everyone else that a simple note to say, "Thank you," and that you enjoyed the class would be sufficient.
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If I tell you I'm unique, and you say, "Yeah, we all are," you've missed the whole point.
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RAADS-R: 187.0
Language: 15.0 • Social Relatedness: 81.0 • Sensory/Motor: 52.0 • Circumscribed Interests: 40.0
Your neurodiverse (Aspie) score: 165 of 200
Your neurotypical (non-autistic) score: 47 of 200
You are very likely neurodiverse (Aspie)