Was I right to stand up for a loved one?

My brother just underwent a big surgery and his friend made fun of him. She's always mean to him, and uses him as a free therapist, but this time it was really bad. I started shaking and without even realising, I texted her and told her to leave him alone and never talk to him again. I don't know if I did the right thing?
Was I right to stand up for a loved one?
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