Everyone more or less laughed and made fun of special children (and also "weird" or "abnormal" people) at one point in their lives, you'd be lying if you deny that.
My question is,
Why do we laugh?
Is it because it is genuinely funny, thus we laugh?
Is it to make ourselves better? if so what's the difference?
It is genuinely funny because they aren't normal.
Is there something wrong with that?
Laughing has different reasons and thoughts. Sometimes we laugh at someone because they say things that sound funny, sometimes we laugh with a though that the person is crazy or they are not normal, sometimes we laugh with a thought that we are better than them and they are inferior to us. If the intention of laughing is the feeling that we are better than them and they are laughable idiots then that is wrong. Sometimes we just laughs with a mere innocent laughter. We laugh with them but lovingly accepting and understanding them.