How do I convince my friend that Tourette Syndrome is not fake?

I was diagnosed with Tourette Syndrome including related disorders like OCD, etc., 19 years ago. The problems is, when I tell some friends that I see a psychiatrist and take medication, they tell me: "Tourette Syndrome isn't real.... You don't have it.... Don't buy into those syndromes and... show more I was diagnosed with Tourette Syndrome including related disorders like OCD, etc., 19 years ago.
The problems is, when I tell some friends that I see a psychiatrist and take medication, they tell me:
"Tourette Syndrome isn't real.... You don't have it.... Don't buy into those syndromes and disorders"

They think it's all psychological and not biological (which it is). My brain is physically wired to act this way. Their ignorance makes me upset.
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