Can someone explain to me how putting a rainbow in a classroom is "indoctrination," but the Ten Commandments isn't?

[KS Toronado]

9. If rainbows were allowed in classrooms, education would go to hell

kids would look at the rainbows (while they should be listening to the teacher) and start dreaming about how
beautiful they are while past memories dance in their heads about standing in the colorful warmth of one's
starting & ending glory. And before you know it all grade school children will be walking around looking for
where rainbows start & stop like zombies and when they arrive there they'll lay down and soak up the rays
while listening to Jesus tell them they don't need the 10 suggestions, just love their neighbor as themselves
and that's good enough.Then they'll go back to school and destroy the 10 suggestions and then Rs will be
forced to raise taxes to replace them. It's a vicious cycle, best to keep rainbows out of classrooms before
we can't afford them anymore.

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