Hello there,
The moderators of the Shipping section have decided to have this rule changed. Previously, a one-liner constituted as a line of text that spanned through one-line of the text box. However, it has now been changed to where it is just one line of short text. As long as you elaborate and not just post something like "I agree, it's funny" or something akin to that you should be all good. If you have any questions, please don't hesitate to ask any of us and we'd be more than happy to help you out.

Examples for clarification:
"I agree, it's wrong." <- Super easy to see how this would be a one-liner, right? It kind of is self-explanatory.
"I agree, it's wrong because I don't exactly view it like that, and others may feel differently because blahblahblah." While it's only two sentences or so, it's elaborate on and provides insight and can contribute to the conversation to help elicit a response.

Got it? I'll be updating the rule shortly.