B737-700 flight crew reported improper clean up sequence during departure climb resulting in momentary aircraft performance issues.

Narrative

We were operating leg 3 of 4. I was on day 4 of a busy 4 day Pilot Monitoring (PM) trip; while the Captain had just joined the trip after some time off. While taxiing out in ZZZ we were asked to load performance numbers for an intersection departure. With the aircraft at a stop; I loaded the new intersection; and we ran the Departure Plan Checklist; verifying the flaps were set in the correct position (Flaps 1). We then lined up on the runway and started our takeoff role; with me acting as Pilot Flying (PF). there was a strong gusty crosswind and turbulent conditions in ZZZ. After rotation; I called for 'landing gear up' and the Captain responded with 'positive rate - Landing gear up'. I then noticed an unexpected change in performance and the aircraft's handling; and that the low-speed awareness ques where rising and I had lost my Flap 1 maneuvering que and my V2 + 15 'shark tooth'.I lowered the nose to gain airspeed and said; 'something doesn't feel right'. at around 1;000 ft. AGL we noticed that the landing gear was still down; and the Captain had accidentally retracted the flaps instead of the landing gear. We correctly configured the aircraft and continued to climb without any further incident; and never exceeded any structural limitations. While discussing this later; the Captain believed he had been so focused on setting the right flap setting during the Departure Plan Checklist that he sub-consciously grabbed the flap lever instead of the landing gear.I could have been more attentive as to the configuration of the aircraft. Also; we were both starting to feel tired; on top of a long taxi out with multiple changes. I had also been flying a MAX for most of the trip; and assumed the extra noise with the gear down was just because the -700 is a lot louder than the MAX.