Boyfriend said I "complained about us not doing outdoorsy stuff." Is this a red flag?

We've been together for 6 months. We were on the phone and I told my boyfriend that my long distance childhood friend wanted to talk on the phone Saturday morning. I told him I may not be able to hangout that morning, but I can catch up with hin later. He said "That's fine." I said "We haven't done outdoor stuff in awhile." He said "So which do you want? Talk to your friend in the morning or do outdoor stuff? I don't get it. You're complaining about not doing outdoor stuff but you want to talk to your friend." I said "I wasn't complaining. I was just throwing it out there that I miss us doing outdoor stuff together." He got quiet. I felt really hurt because the term "complain" has such a negative context. That was the first time he ever called me a complainer. Is this a red flag?
Boyfriend said I "complained about us not doing outdoorsy stuff." Is this a red flag?
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