How about I don't date someone with mental health issues (like depression) and stay friends instead.
Are they too much effort to be in a relationship with?
My sister is a depressed person and I want no contact with a stupid girl like her.
Yeah, mental health is a really big burden to take on from a partner and you have all the right to refuse to date anyone with it for the sake of your own health. But you shouldn't belittle them like your sister, it's rude and disgusting. She can't help how she feels all the time so you need to support her instead.
I just don't want to be with someone with depression.
I think you should be self aware and know what you are looking for in a relationship so you can be happy.