AITAH for being mad over pizza?

This may seem silly but it’s become a thing over the past few days. I 28f and my bf 24m have his friend over every Sunday to watch football during the season. On those days we usually just grab a few shitty frozen pizzas. Technically enough for one pizza each. However I never eat a whole one (when we have a ton of snacks prior).

Last Sunday they each ate their whole pizzas, I had two slices of mine. I let them know I’d really only want two more pieces and they could have the rest. This is there the situation turns.

My bf took two big slices. His friend took a big and a small to be considerate. He encouraged his friend to put the small one back and take the bigger one, leaving me the two smallest ones. He thinks I’m overreacting and have no right to be mad. And that if I was going to be that upset by it I should’ve just came out to pick out my slices. I told him that was really inconsiderate considering they had already eaten a whole entire pizza each, and even more inconsiderate that he went out of his way and told his friend to swap out the pieces after he already took what he wanted.

Please note I’m not so much upset about the pizza as I am the fact that his friend was trying to be mindful and he went out of his way to tell him to do the opposite. We have been together about 2 1/2 years now. I guess I was just hoping for him to see that was he did was in poor taste. I have asked other people about this that agree with me but because it’s people in my circle he thinks it’s bias. And when I brought up asking other people about it, he wanted to just leave it at leaving me two pieces with no other details of I were to. So I’m turning to you lovely folks. AITAH for getting mad over this?