Imagine someone presents an argument to you. You have roughly two ways to interpret it:
Open-minded people generally interpret what they hear charitably while close-minded people stick to what they think is right and don't bother entertaining other arguments. An open-minded person asks "how could this be right?", a close-minded person asks "how is this wrong?"
Especially on Twitter, snarky repliers will interpret your tweet in the least favorable way possible, identify a weakness in your tweet (which is easy when you've already weakened the tweet with your interpretation), then feel smart when they point out that weakness to you. Of course, everyone else thinks them a fool.
It would make one seem much smarter if they interpreted the tweet in the most charitable way possible, then identify a weakness in it and express it clearly.