"Don't speak like you, or like me some years ago, speak how I learned to speak in order to signal that I'm both perceptive and capable, but also not so rich that I can wisely choose not to signal those traits".

Most people are downright hackable and consistently bugged to that effect regardless of strata. Low key mannerism mimicry (not obvious enough to make it look like you are mocking them) consistently gets you received better along with "proper faking" of desired emotions. For some dumb reason they think "proving they can change their apparent true selves on a whim" means they are more trustworthy instead of less.