I don't want to date people with mental health issues
Why do you dislike mentally ill people?
I don't want to deal with there personality.
So many people in the world have mental health issues. It's wrong to judge them based on that. They need help.
What is there to help them with? They will kill themselves one day or something.
Assuming they will all kill themselves is so wrong. You can have your own preferences when dating. But judging others and thinking they are all defective is wrong.