How to not let people treat me this way?

I want to make something clear, I'd never let someone do this to me outside of work. I'd never let someone walk all over me, and I'd never let someone treat me like shit. I just need to know if I'm being too sensitive.

I've been working in Healthcare for 5+ years as a CNA recently switched to the hospital setting. I work with nurses instead of other CNAs. Last night I was helping a patient to use the urinal in bed, and the nurse said "that's going to spill all over him" I ignored her and kept doing what I was doing. Guess what? It didn't spill. It bothered me cause I feel like they can be bossy at me at times. What are some boundaries I can set where they respect me more? I've already had to stand up more than a handful of times at them when they were being this way. I want to be assertive, confident and respected. Or am I just being too sensitive?

How to not let people treat me this way?
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