It will mainly depend on the way you express the word, how strong and loud it sounds. Even a small word can have a different meaning along in a different context or sentence or situation.
"jerk" fits in the word for "stupid" "idiot" or something along those lines is "baka" or you could also user with "Bakayaro".
No word is disrespectful. It's how and when you say itthat matters. And in this sense, the use of the word 'what' can be very disrespectful indeed.
No, it is very respectful to say these words most anywhere in the world.
shaking hands
Nah! what do you think?
Yes it is very disrespectful.
It is very disrespectful, as disrespectful as spitting in a person's face or calling them an obscene name.
TOTEMO furui
because it was very rude and disrespectful to the guys.
It is disrespectful to say because Eddie Mabo did a very respectful thing in Australia's/ Aboriginal 's history.
Hijo ni kanashii
U ask your mom
You may say 'Sugoku/Totemo oishii desu.'