I have had multiple (heated) conversations with atheists (and ex-Muslims) on Twitter. In numerous cases, the conversation drifts towards subjective vs. objective morality and the freedom to blaspheme religions. In these two contexts, I was able to spot many self-refuting claims that were made. Here are my top 4:
The general meaning or intention behind these tweets might have been nice or even valid. However, framing your opinions in a coherent and logical way is vital, specially in the context of a theism-atheism debate. Don’t get me wrong, theists also make self-refuting claims, I’m just pointing out from my own experience which was primarily with atheists.
You can familiarize yourself with more examples of self-defeating statements by checking this article by Dr. Sean McDowell.