Not true at all.

https://www.aopa.org/go-fly/medical-resources/health-conditi...

Why do people comment on things they know nothing about? Of course you can.

It's HN.... I get a good laugh out of all these aviation related threads. Understandably your average CS undergrad doesn't have much real aeronautical knowledge but that doesn't stop everyone from blowing up the comments every time the word 'airplane' is uttered.

You can, but you're not allowed to fly at night.

No you just get a night flying and color signals proscription on your certificate if you're a monochromat or dichromat (full color blindness); if you merely have a color discrimination problem by being an anomalous trichromat, you might pass the test, or fail it but then get an exemption (reversal of the prior failure) by later passing a more involve series of tests.

My father is red-green colorblind and he flies small planes.