One thing that I continually come across is the stigma that if you accept the Theory of Evolution as fact, that you MUST be an Atheist. To be blunt, it pisses me off that this persists - Not only do they think they are synonymous, but they associate it with evil. I've come across Atheists who do not fully accept Evolution as the correct theory to describe the diversity of life. Conversely, I know MANY religious folk (including my Catholic girlfriend and her family) who do accept Evolution.
I think most of this has risen from my frequent visits to a Facebook Group called "we can find 1,000,000 people who don't believe in Evolution befor (sic) June" - Ignorance and self-righteous people who continually spout fallacy after fallacy, regurgitating falsehoods they heard from others. I just can't help sticking around that page using my knowledge of geology to not just debate logical fallacies, but to also educate those who truly don't understand how science works.
But I digress. I'm just easily frustrated with people who refuse to look at something from another point of view and think that their opinion is infallible and 100 percent true. Any scientist will tell you that they do not know something with 100% certainty. That's humility - an aspect some religious zealots are clearly lacking.