AITA for telling my boyfriend he’s being sexist?

My (32f) boyfriend (34m) said recently that an idea I had for storing my friends mattress at our house is a “girl plan”.

I asked, “what’s a girl plan?”

He said that a girl plan is a plan based on emotion, not logic. Boy plans, on the other hand, are based in reason and logic.

I told him that he was being sexist, and he disagreed.

Am I the asshole??