AITA for refusing to let my coworker take credit for my work on a big project?

At work, I spent weeks putting together a detailed presentation and proposal for an upcoming client pitch. On the day we presented it, my coworker started referring to the work as "our joint effort" even though they didn’t contribute anything significant. My manager seemed to accept this without asking me.
I calmly corrected them during the meeting, saying that I had prepared the material and appreciated input from anyone who contributed. My coworker got visibly annoyed and whispered to me afterward that I was being "too dramatic" and should have just let it slide.
AITA for calling out the fact that the work was primarily mine, even though it created tension with my coworker and made the meeting slightly awkward