Interviewers aren't trying to be rude. They've just drunk a lot of toxic lemonade themselves. They'll say "We need your past salary information."
Really? You need it? I understand that people in Hell need ice water, my darling.
They don't need to know your past salaries. They just want it. As we tell our kids, Want and Need are two different things.
Tell them your salary requirement, instead. That's all they need to make a Yes or No decision about whether your salary requirements and their salary range are in the same ballpark.