What is an appropriate response for when someone tries to derail a conversation by saying, "I don't like your tone"?

Anonymous
Background details: I am in a middle management position in a public school where I am expected to oversee clinical services provided in the special education sub-separate rooms and for students in the inclusion setting. My role involves writing and implementing Behavior Support Plans targeted to decrease challenging behaviors like aggression, property destruction, rude language, screaming, etc. I oversee staff implementing the plans, which includes paraprofessionals in the sub-separate rooms, the special education teachers, and the inclusion teachers, assist them with training as needed, and provide feedback. It's a leadership position, but I am not an administrator.

I have a strong rapport with teachers in the inclusion setting, the psychologist, the counselors, the occupational therapist, and the speech language pathologists. There are no barriers when working with them.

My problem is a couple of the paraprofessionals in the sub-separate rooms. Since I first started (literally), they have screamed at me when I've tried to train them and give them feedback (sometimes in front of the kids), going as far as to follow me out of a room and to my office. One in particular is overtly resistant to feedback (rolling eyes, exaggerated grin, laughing, interrupting with things like "OK! OK! OK!") and the other one is more subtle. They gang up on me and feed off of each other. I've also been told they complain/gossip about me when I'm not there.

A couple weeks ago, one of the paraprofessionals entered my office screaming at me and refusing to leave (I asked 3 times before she finally left and continued screaming in the hallway/stairwell). She then went to the union and said that she screamed at me because she didn't like my tone earlier when I was in the classroom dropping off paperwork.

The person I replaced was part-time. I'm full-time and I think the paraprofessionals are struggling with having someone there giving them feedback more frequently.
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What is an appropriate response for when someone tries to derail a conversation by saying, "I don't like your tone?" I want to remain open to hearing feedback about my tone without them trying to derail the conversation or justify their own unprofessional behavior.
What is an appropriate response for when someone tries to derail a conversation by saying, "I don't like your tone"?
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