If someone who doesn't involve you in their child's life (like birthdays and other things) and doesnt take interest in your children's life either (doesn't acknowledge birthdays), phones you and tells you to make a cake for a big event their child is taking part in because her whole family will be there and they need a big cake. Then they give you instructions on what kind of cake they want. No invite or comments such as "we'd like you to be there too".
Isn't this incredibly rude?