As long as you kept calm and didn't raise your voice too much, I think this was worth the effort. Thank you. Maybe one of them will have a little nagging voice in their head that will eventually cause them to do a little research.
There are people in my life that I frequently have to ask to please allow me to finish speaking, then I will listen to you. Some people think that if what you're saying is in opposition to what they believe, they have the right to speak over you, because in their small minds, you are wrong, witnesses & non- witnesses alike.