What’s up with cashiers in coffee shops not listening when they ask for my order?

I wait for them to ask, I announce it loudly and clearly. They interrupt. I confirm. I go on to item two. They confirm. I confirm.

Then, they apologise and try to guess item one again. They get it wrong. I correct them. They’ve got it.

Oh yeah, what was item two? Yes, that’s right.

Also, what’s the deal with not waiting even for a split second between me saying “flat white” and “with two sugars”?

I understand that coffee shops are loud and hectic, and I might have to repeat myself once in a while, but damn Melbourne, every time?