Careless talk

When someone speaks without sensitivity or regard for other peoples feelings who may be in the proximity.

Jamie meets a girl with a Purple dress at an elevator, he smiles and walks away. Later Jamie decides to look up the name of the girl and sends her an email which reads. "Sorry for staring at you earlier. It's just Purple is my favorite colour. Let me know when you decide to get the lift again and I will stare some more." - This could be seen by some as being an unwelcome email and a prime example where "Careless talk"was used.