It's perfect for when you want to make it clear that you acknowledge the message and are choosing not to respond. Some people will view it as passive-aggressive, which it is, but it's also really funny.
This is the most funny when it is following an opinion that is not even REMOTELY controversial, or better yet ?? after you state a fact.
Get creative with it
Ps works best when addressing a group of people, at least 2 or 3 will always giggle
…as in “stop talking.”
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I was at an event last night in which the host, a born thespian, was pontificating at great length. Someone in the crowd shouted “say less” and it def hit me (and the host) in this way which made us both lol