Many people avoid flirting entirely out of a paralyzing fear of being labeled "creepy." The good news is that creepiness is not an inherent trait; it is simply a failure to read social calibration. Flirting is a two-way biofeedback loop. If you are paying attention to their signals, you can flirt boldly without ever crossing the line.
The Definition of 'Creepy'
Creepiness occurs when someone completely ignores the other person's discomfort signals and continues to escalate the interaction. If you give a compliment, and they lean away and give a one-word answer, continuing to compliment them is creepy. If you back off immediately, you are socially calibrated.
Rule 1: The Plausible Deniability Approach
Never trap someone in an immediate "Yes/No" romantic decision. Say, "That jacket is incredible, you have great style," and then turn slightly away. This compliment has "plausible deniability." It could be romantic, or it could be friendly. It gives them the freedom to either escalate ("Thank you, are you from around here?") or accept it platonically without awkwardness.
Rule 2: Respect the Escape Route
Never stand physically blocking someone's exit path (like standing in a doorway or trapping them at a bar corner). People feel safe—and therefore open to flirting—when they know they have physical and social freedom to leave at any moment.
Rule 3: Match the Investment
If you ask a three-sentence question, and they give a one-word answer, do not ask another three-sentence question. You are over-investing in someone who is under-investing. Pull back. Charm is knowing when to gracefully walk away.