Not everyone who uses these terms has a poor work attitude. But that may not be the impression you give your co-workers and managers when you say them.
Every population fights some type of stereotype, myth, or misinformation, and people with disabilities are no exception. Do you believe any disability stereotypes? You might be surprised.
Should I use the term “disabled person” or a “person with a disability.” Our first inclination is to use the former, which is called Person First language. However, there are many people who prefer “disabled person”; this word structure denotes Identity First language. Both sides of the debate have interesting points explained here.