Replying to Atheism

Let me start this off by saying I am fully respectful and tolerant of anyone's religious beliefs.

Atheists, why do many of you (not all but a good amount) feel the need to tell everyone you're an atheist? I see comments everywhere online of people bringing up their atheism, saying "God's not real" wherever they can get it off. Someone says something trivial "Oh my god ...." The response is "God doesn't exist. Its in twitter bios, facebook profiles, all over.

I don't understand the need for many Atheists to try to relate everything to their atheism. I don't play golf, but i don't feel the need to put it in bios and bring up how much I don't play golf in every scenario where golf is mentioned. (Neil deGrasse Tyson said something to the extent of that). Just trying to hear others thoughts on this, and why Atheists are now trying to "evangelize" the same way many religious people try to recruit people to their religion.

Sorry for the shitstorm that may or may not happen because of this, just trying to ask a question