Lost confidence

I lost confidence one incident.

Sometimes we see mentally-deficiented person. If I saw them on the train or near by me, it may feel fear. It has no alternative thing because sometimes they take strange actions.

I cannot say that don't walk away from a mentally-deficiented person, but absolutely we can not laugh of them even if they took strange actions.

Someone does an impression of the mentally-deficiented person and laughing. I have never understood why someone laughed. I have never understood why someone can be to laugh.

Even if someone has been very clever and smart, someone who like laughing a mentally-dediciented is horrible as a person.

I lost confidence the someone.