>>512195917
Empirically, those who call themselves "atheists" tend to hold beliefs that fall into a distinct constellation. One typical atheist belief is that they get to just "define" atheism in a way that includes a bunch of people who would never willingly associate themselves with this demographic.
If you argue this point to an atheist, sooner or later he will revert to slandering whatever he thinks your religion is, or making some strawmen about theists, even if you never express any theistic beliefs. At that point, he has determined that you are NOT an atheist, even though you may very well be one by his bogus definition. Why? Simply because you disagree with his characteristic atheist philosophy and atheist pattern of thought. This WILL happen REGARDLESS of your belief in deities or lack thereof. The atheist intuitively rejects the same definition he expects others to accept.