I DON'T FEEL BAD ABOUT DISLIKING DONALD TRUMP

I don't feel bad about disliking Donald Trump!

My brother reminded me of another reason to dislike Donald Trump (as if I needed one).  He recalled that when Cyndi Lauper appeared on  Celebrity Apprentice the boorish Donald Trump attempted to correct Lauper when she said, "I feel bad." and he cavalierly corrected her by saying, "You feel badly."; unfortunately, she let him get by with that bullying attempt.  

It's difficult to imagine anyone being able to tolerate Trump long enough to watch that show, but like that incident,  I have actually had people--not very subtly--try to correct my usage of "I feel bad" by uttering "I feel badly" shortly thereafter.  It just provided me with an opportunity to tell about Miss Digman, my favorite grammarian, grabbing the hand of a classmate who had said the unpardonable phrase "I feel badly", and scolding, "You feel BAD unless your fingers aren't working properly."

BAD is an adjective;  BADLY is an ADVERB.  Adjectives describe nouns or pronouns;  thus, "I" (the pronoun), feel BAD!  Adverbs modify VERBS:  e.g.:  "He was BADLY injured."

Didn't people learn about adjectives and adverbs in school or perhaps they think that "badly" sounds better? 

Do people say or write 'I FEEL GLADLY", "I FEEL MADLY", "I FEEL SADLY" or "I FEEL HAPPILY"?