Had a small argument with my boyfriend over washing his underwear?

My boyfriend has gone away on a trip. Before he left I teasingly asked him how many pairs of underwear he’d take and how often he’d wash them.

So he went on the trip. It’s been a few days in and I teasingly asked if he’d washed his underwear yet. It was not meant to be offensive, just banter. He got really mad at me and told me to stop being mean. He said he won’t answer the question.

Was I out of order? Should I apologise?

Had a small argument with my boyfriend over washing his underwear?
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