Some are willing to use the Establishment Clause and the demand for neutrality to silence religious advocacy in classroom at publicly funded schools, yet have no compunction about atheist advocacy in those very same institutions.
Are they hypocrites?
No, they’re not being hypocritical. It is wrong to advocate for a religion in the public university, because when religious ideas are presented, they have to be presented in a neutral manner, without endorsement. However, atheism is not more a religion than not collecting stamps is a hobby. Therefore we can shove atheism down your throat to our heart’s content, since it is not a religion, but is instead a non-religion, and treats all religions with equal contempt. Besides, all we’re doing when we are creating atheists is supporting science and critical thinking.