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Badder is not a word in the English language. Worse is the correct word. When using worse, you never put more in front of it. More is pretty much like the -er ending to adjectives. Like with the word pretty you say prettier or more pretty, not more prettier.
I am a good boy! I don't use bad words. I don't know any in Tamil and don't want to know. So the question of my teaching bad words to others does not arise. I know a few in Hindi which my seniors at BITS Pilani forced me to learn during ragging sessions and I have never used them.