Wait a minuite PLEASE!!!!!

Recently, I feel people are getting more and more impatience. I'm a shopgirl at a cake shop, that I take various complaint from the customer. We have to be care about the usage of the cakes so it's necessary to be a little slow. However, the cursory customers say "Please, be more faster!". I'm really angry with these matters because of their manner. They spend a very long time to choosing cakes! They are really contradicted...