Yeah, I mean, if you don't normally go around telling attractive people, apropos of nothing, that you'd like to sleep with them, it's not really being yourself to start doing that.
"Be yourself" doesn't mean "give voice to every thought which passes your mind", it just means "don't change how you normally present yourself just because you're [giving a presentation|interviewing for a job|going out on a first date]"
yes, exactly. i feel like sometimes people take these instructions far to lightly. "be yourself" can be understood to mean, "you should pursue life in such a way that it aligns with your core values and your core identity". It doesn't mean you shouldn't work to improve yourself. Exercising constraint, using tact, being deft and/or subtle in how you respond to people can be very much in line with "who you are". If you are is "loving, respectful" then you can be careful about how you respond to people so that they are felt loved and respected.
"Be yourself" doesn't mean "give voice to every thought which passes your mind", it just means "don't change how you normally present yourself just because you're [giving a presentation|interviewing for a job|going out on a first date]"