What's the kid with Down syndrome's favourite song? Dial up tones.
You should not be making jokes about people with disabilities.
I'm only joking. It's just a joke. Lighten up.
That does not mean it is not hurtful to say. Words can still hurt even if they are jokes.
It's just my opinion.
You need to be more cognizant of how words can affect people. It is not good to make fun of others.