Is it normal for a coworker to get annoyed that I want to take an early lunch break?

Anonymous
I normally take my lunch break at noon, but today I skipped breakfast, and I needed to eat, so I said I was going to leave at 11:20 to get food. The woman I work with got upset over this, and said that it wasn’t right, since we need to “time these things out” in the office, and how it was “inconvenient”.
Is it normal for a coworker to get annoyed that I want to take an early lunch break?
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