My boyfriend thinks science is an impractical subject and we don't get to experience it in our daily lives--I'm losing brain cells here 😭

I had this fun argument with my boyfriend until he took a hit on my academics after which it became serious. I just need to vent because I can't believe what I heard.

It all started with him claiming that science is an impractical subject, we don't get to experience it in our daily lives and how commerce is a much more practical field which gives us more experience.

My counter argument was that you have different interests that doesn't make science impractical. Infact, we experience science every day, half the things we're able to do is because of science. Idk what part of my argument irked him so much, he was just not ready to listen and kept saying only basics of science is used advanced science is useless.

And then comes the kicker. He said what do you gain by learning about sine, cos, tan. Like excuse me? Trigonometry is a branch of mathematics not science, but his genius rebuttal was "then why is it taught in science?" Dude, just because you don't know the difference between subjects doesn't mean you rewrite the entire curriculum.

When he couldn't argue back anymore he took a hit on my academics by saying "You're defending science as if you're aiming for IIT". IIT aspirants aren't the only ones who have such basic knowledge. That was a downright hurtful comment.

For context, he's from commerce background and I'm from science (I'm not excelling academically but he's doing fine). He's like those indian uncle and aunties who believe science is the end of the world and that arts and commerce is useless except that he does the same for commerce.

Honestly, I'm stunned by how much basic knowledge a person can lack. How do you even have an argument with someone who doesn't even know such basic stuff and mixes up subjects and then gets defensive when corrected? Was I wrong for whatever I said and getting upset over what he said about my academics? Should have I just backed down and agreed with him?

Edit: My bad, I didn't know mathematics was a part of science. But my argument isn't science versus commerce. I simply wanted him to admit that his interests are different and that doesn't have to make science impractical and useless. I know science and commerce are both needed in our daily lives. I just wanted him to know all streams are equally important, we just have different interests.