Why are some disabled people so mean?

today I saw this older disable woman having a really hard time opening a door so I went over and opened the door for her. She gave me a dirty look and didn't even thank me. Once inside the store she started holding her purse like I was going to steal it.
Update: This isn't the only disabled people who's been mean towards me. So I made a promise to myself today not to help another disabled person.
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