I think you mean different meanings of the word 'comrade'. It's ok to call a friend 'my old comrade', for example. Or sometimes 'comrade' means just 'a person' (but with little satiric connotation). But when you mean an address to someone, like 'sir' or 'mister', it's not a good idea.
I hope it was helpful for your collection of Russian bizarre stuff, Deborah.