Everything is ableist if you think about it enough. “Just get a car rhetoric” is ableist against blind people. Even “just take public transit” is ableist against immunocompromised people.

A society should make accommodations for those with special needs, but we don’t have to give those accommodations to everyone who asks. Some people will need a car, that doesn’t mean your average able bodied person should be driving one, and most of the “just take a bike” rehtoric is directed towards those people.