Title text: 'But you're using that same tactic to try to feel superior to me, too!' 'Sorry, that accusation expires after one use per conversation.'
In public debates, fundamentalist Christians and (fundamentalist) atheists, while having different opinions, can behave surprisingly similar. Both can be very dogmatic about their beliefs, and be very disrespectful and accusative towards people of the other standpoint. Cueball is blaming both parties for being annoying, and he can feel superior to them both. Megan points this out, and could then feel smugly superior to Cueball.
The title text points out that such a superiority argument could go on ad infinitum. But by introducing an arbitrary stop rule ("expires after one use per conversation"), Megan tries to resolves this issue and (superiorly) win the argument.
- [Cueball and Megan talking.]
- Cueball: Personally, I find atheists just as annoying as fundamentalist Christians.
- Megan: Well, the important thing is that you've found a way to feel superior to both.