Can I use the handicap restroom?
Why do you want to use a handicap restroom?
I just feel like using it
Even if you like how spacious those bathrooms are, it is wrong to use them when you don't need to. It could prevent somebody who really needs it from using it when they need to.
I want to use it and also I'm going to a popular restaurant which is 24-hours so I don't care even if that makes you feel uncomfortable.
People are expected to follow rules and there is no reason for you to break this one. Just use the appropriate restroom for you.