[Okay, maybe it's a sibling thing to take that in the worst way possible, but the way Eiffel sees it...]

So, uh. Your dad, who knew exactly what you wanted, made a joke out of your whole birthday and made you really freaking embarrassed to care about it.

But your brother... got the thing you wanted, at like- probably the cost of not getting any actual presents he wanted for himself, and then offered to give it to you because he knew how much it meant to you?

[A brief pause.] And you're mad at your brother for gaming your dad's shitty system to do something nice for you?