Is it normal for my boyfriend to defend a coworker who bullies me?

There is a woman at my workplace. Since I started this new job, she has been verbally teasing or provoking me. I’ve told my partner about many of these incidents.
Today, I shared one of my achievements on WhatsApp. While talking to my partner, I said, “Now that woman will probably see it and get jealous.” He replied, “Why? What does that have to do with anything? Didn’t she earn this certificate?” I said, “No, maybe she’s ignorant.” Then he said, “Why are you calling people ignorant?” As the argument continued, he also said, “Why do you think she’s jealous of you? When she shares something, do you get jealous?”
I replied, “I don’t know how educated or knowledgeable she is, and I’m not even sure whether she’s jealous of me or not, but it feels strange that you’re defending her.” Then he said, “I’m just trying to understand.”
Do you think his reaction is normal? He doesn’t know that woman; he has only seen her photo. But that woman is also well-groomed, and her looks are average.
Is it normal for my boyfriend to defend a coworker who bullies me?
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