Sometimes, the only appropriate reply is to raise your eyes in disbelief.
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https://blogs.control-g.co.uk/sarkykuntz/wp-content/uploads/sites/7/2016/04/raise_eyebrows.gif
When someone posts something so unbelievably stupid that there is no intelligent comment to be made, try rolls_eyes!
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https://blogs.control-g.co.uk/sarkykuntz/wp-content/uploads/sites/7/2016/04/rolls_eyes.gif