In computing, the ! is the 'not' sign and denotes flipping the value, so !true is false. Also, <> can mean unequal, which is sometimes expressed like !=, so 'not <>' means equality (which is either == or === depending on your language). Computer scientist probably shouldn't make protest signs, it could lead to mixed signals.
Happy almost Birthday to my father-in-law!
Text:
Title: A Logical Protest
Sign 1: !HAPPY
Sign 2: YOU'RE !COOL
Sign 3: <> with a red slash through it
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