Am I being lazy?

This weekend, on Sat, I took my GF to go return her stuff that she bought at the mall, I asked her to go early but she ended up lingering around and we got to the mall later than I wanted (mall is about 20 miles away). I then found out I need to return some stuff near by, so I dropped her off at the mall and she went to return her stuff at 4-5 different store. Then I picked her up and drove her back home.

Because we came late on Sat, we couldn't returned everything, so on Sunday she drove to my house (near the mall), and I once again took her to return her stuff. After an hour or 2 of walking around and return at 4-5 more stores, the last one was Walmart, which locate between my house and her house.

I asked if she can just drop by Walmart on her way back home and do it, she blew up at me, saying that I'm a bad BF and that I'm being lazy and that none of her ex BF is like this.

We get into a big fight. She later texted me and said that she's not in the wrong, that she "asked" people and they agreed with her that I should have taken her to Walmart.

I'm posting this asking for advice and opinions of those that do not know either of us for a fair view of the situation.