What does this joke mean?

some kid told me a joke and i was like 'huh?' does anyone know what it means?? P1:I bet i can make u say purple P2: ok, try me P1:say blue P2:blue... P1:say pink ...P2:pink... P1:say orange P2:orange... P1:whats 1+1 P2:2... P1:whats 2+2 P2:4... P1:HA! I TOLD U I CUD MAKE U SAY 4! P2:no, u sed u cud make... show more some kid told me a joke and i was like 'huh?'
does anyone know what it means??
P1:I bet i can make u say purple P2: ok, try me P1:say blue P2:blue... P1:say pink ...P2:pink... P1:say orange P2:orange... P1:whats 1+1 P2:2... P1:whats 2+2 P2:4... P1:HA! I TOLD U I CUD MAKE U SAY 4! P2:no, u sed u cud make me say purple... DAMMIT! like if you get it!
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