Using 'tattle' can imply disapproval since it often involves telling on someone, sometimes seen as betrayal. Tom didn't want to tattle on his friend, even though he broke the rules.
Pro Tip 2/3
Childish Behavior
'Tattle' is often associated with children's behavior in telling adults about peers' actions. The teacher told the students to solve their problems without tattling.
Pro Tip 3/3
Authority Figure
Tattling typically involves informing a person with higher status or control, like a teacher or boss. If you tattle to the supervisor, you might not be trusted by your coworkers.