What would your life be like if you never had to feel offended?
You could still not like certain things or behaviors, and could still take steps to protect yourselves from them, but you wouldn't have to feel bad about it in the process.
Other people could do whatever they wanted and it wouldn't MAKE you feel anything. (Pro tip: People can do whatever they want already. The only thing that would change would be how you felt about it.)
YOUR CHALLENGE, SHOULD YOU CHOOSE TO ACCEPT IT
Notice what feeling "offended" feels like. Do you like feeling that way? When you feel that way, does it help you get the things that you want? Does feeling that way give you the experience you want to have?
If a patient disrespects you, does feeling offended by it make your day better or worse? Does feeling offended change the patient's behavior? Does it help you love your job?
What you feel is your choice. I'd suggest making the choice that helps you be the person you want to be.