Since I’m on a rambly mood, here’s some serious thoughts;
Your ability to show empathy towards disabled people is not tested when you see a well-put together person in a wheelchair.
It is tested when someone obviously mentally ill is taking too long in the line, when someone haggard asks you for a coin, when someone clearly intellectually disabled and yet an adult is acting up.
Disability is not always cute, it is not always kind. It is not always comforting. Quite often it is dirty and unfair and rough.
Even if you are disabled yourself, you can have ableistic thoughts.
The best you can do is accept the flaw in those thoughts and still treat the person with respect.