Quote Originally Posted by Anixx View Post
Calling someone "comrade" is very much OK.
if in addressing i'd perceive it as mocking, but if it's somehow genuine it sounds very unnatural, i recall a scene from "Moscow on the Hudson" where all dialogues in Russian happening in the US sound super ridiculous and corny

the thing that irks me about Russian is that we don't use humane terms for address such as Sir, Mister, Miss, Missis, Ma'am, so another thing to remember for foreigners is how to address people when you're trying to draw their attention, according to gender and age
a young lady - девушка!
a women over thirty y.o. - женщина!
a young man - молодой человек! мужчина!
a man over thirty y.o. - мужчина!

if even being over 30 or older a person looks younger people may use address for a young person, or just because they don't give much thought about that person's age

the same terms are used when speaking about a (wo)man in 3d person in their presence

these all are neutral addresses, there're of course more informal slang terms equivalent to buddy, mate, dude etc.

in trying to be cold when addressing someone уважаемый/ая! can be used, it's not offensive though

i strive to use господин/госпожа (sir/miss, missis) where possible, but so far have never tried to use it in direct address, but i neither will use the abovelisted ones, cause they sound dorky to me