Superlative qualifier added to a childish argument in hopes of eliminating any potential for a further retort (of course, anyone who's been involved in a childish argument knows that you can just add

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TIMESINFINITY

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Possible rebuttal in a childish argument
Retort in a playground argument
Childish retort
Childish retort to "Are not!"
Schoolyard argument retort
Childish proposal to a potential playmate
Counter, as an argument
Deceptive argument
Argument's foundation
1998 movie with a "Dude!" argument
Start of a childish plaint
Like a sound argument
Term of address used during an argument
Tending to cause an argument
Counters by argument
Argument over a baby toy
Vulgar group avoided argument
Side in an argument
More than an argument
Childish rebuttal
Conveniently weak argument, metaphorically
Comeback in a kids' argument
Draw into an argument
Engaged in a petty argument
___ ponens (classic logical argument)