What is Aarya Upavaada?

Based on a real situation, I have come across some people who claim to be Sotapanna and Sakadaagaami.. When i have gotten angry or upset about something they said or did, i was told i am committing Aarya Upavaada. This is nothing to do with Dhamma but personal issues such as relationships and finances. I am told if i get angry or upset with them, i am still committing Aarya Upavaada as the people involved are Aarya. With Sutta references, could someone tell me if this is indeed Aarya Upavaada and what actually constitutes Aarya Upavaada?