I prefer to take people as individuals. Granted, sometimes a generality can make a quick and accurate point, but it's often far too easy to blanket everyone with that generality instead of listening to what they have to say. When it comes to atheists or anti-theists, some of them may be upset and bring it up because it is so often brought up in their lives without their having any peace from it.
How often does an atheist hear from family members "I'm praying for you," or "you're going to burn in hell if you don't believe," or my favorite "it's just a phase." As an atheist, I can tell you that there are often times I feel like I am on the receiving end of judgment by the country at large, and I haven't done anything to merit that scrutiny. The vast, vast majority of people who live in the U.S. are religious, most of them Christian. It's not so easy to find a place to rest from the constant onslaught of religions sentiments, and religious imagery that some demand be placed everywhere, including on our money. I can understand that frustration.
I was once a fundamentalist Christian minister. I was deeply conservative, dedicated and devoted to my God, and with my whole heart I served Him, loved Him, and I loved His Son who died for all of us and covered us in His saving blood, washing us white as snow, that we would one day meet the Master of the House who created us. I no longer believe that, but I also do not criticize those who do, unless they wish to force me out of the country, silence my voice when I go to vote, reject my right to representation in our government, or deny me a job or housing.
Over many years, my perspectives on many things have changed. Many things, and a lot of it happened here on this message board. I would be glad to discuss that with you any time.
And with you, also.