I want to turn someone down over appearance
Why would you turn someone down just because of their appearance?
I can't stand to look at their features anymore.
Its ok to have certain preferences when you are dating and looking for a relationship, so dont beat yourself up about not wanting to date someone who is overweight. Just be careful not to judge someone as a person based on their appearance because you dont want to get into the habit of judging a book by its cover.
You are right. It's not okay to judge people who are overweight and it is wrong to not want to date someone who is overweight.
That is good you see it that way. No one gets to choose how they look and if they are overweight, there is probably a reason for it. Find the good in them and focus on that.