Does it anger you when christians proclaim the "truth" of the bible, effectively saying that atheists don't have a clue?
I don't pay any attention. They are just doing what they were taught.
I also don't bother, or argue with, Buddhists, Muslims, or Hindus, many of whom I'm friends with here in Thailand.
What others believe isn't my business, as long as they aren't making my beliefs their business.
its there problem, not mine. if it starts bothering me it becomes my problem too.