Ethics On Texting

We haven't really discussed Ethics yet, but the next reading deals with Ethics. The other day I was in one of my classes where my professor will kick you out if she sees your phone. Well one of my classmates had her phone out and was kicked out. My question is should she have been kicked out when she technically pays to be in that class? It is rude to text while someone is lecturing, but when you are paying that professors paycheck and tutition is at an all time high, should you not be able to text if you want or need to? I do not text unless it's an emergency, but what is ethically correct?