Your comment, although well-meaning, also didn't add anything to the conversation. People tend to vote those down.
2) Any pronoun in that case would be superfluous. "Holy crap! Congratulations!" would be far more intuitive to native english speakers. Choosing to add a gendered pronoun without knowing the correct gender is just... odd. That's exactly the type of situation most would avoid where possible: you omit gendered pronouns unless you know.