That was funny... except he was wrong about the "feel badly" part. Feeling badly implies that there is some issue with a person's ability to feel, and saying that you "feel bad" can be interpreted as simply the opposite of feeling good.
If you try it with different words, the rule is pretty clear. Nobody would say that they "feel happily" (unless a mammogram for Beyonce was involved... then it would be, "Of course I will feel. Happily.") They would say they "feel happy".
goodly-good
hungrily-hungry
sickly-sick
tiredly-tired
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