You were fine, IMO. I find this in all kinds of situations; someone gives off huffy vibes as they push past me, when I didn't know they had wanted to get by, and I want to say, "If you'd said excuse me, I'd have moved."
Same thing happened the other day in the wine shop. I was looking at a display near the front of the store, and there was a woman standing there too, kind of at 90 degrees from me. I wasn't really paying attention to her, and kind of assumed she was also looking at the same display. When she kind of huffed and squeezed past me, I looked up and realized I was blocking the most direct path (but not the ONLY path) to the checkout. Honestly, I wasn't doing it on purpose, and if she had said, "Excuse me, can I get by?" I'd have moved.