I don' think that there is a slang word for rude.
more rude most rude
yes, jerk is a rude word because it is insulting something.
F is not a word, but a letter. Depending on what word you're thinking of, it may or may not be rude.
yes it is very rude
that boy is very rude
Polite is a 6-letter word that is the opposite of rude.
No
Several opposites of the word rude (abrupt, impolite) are: mannerly, polite, kind.
Yes, they can be a rude words when directing them at someone.
It's medium-rude. The correct term is flatulence.
Although it's fine to say to people you're close with (such as your friends), duh is a rude way to imply the answer "yes" is obvious.