I’m going to be pedantic here – because I can.
Swearing, as a Biblical offense, means that you are literally calling on God for something trivial, stupid, evil, poorly-thought-out, etc. This is prohibited by the 2nd Commandment.
Swearing, in social terms, means using specific words or phrases that are deemed taboo for some reason or another.
Charlie is doing neither, and whoever was teaching that kid needs a swift kick for crippling the kid’s social development.
Pedantry done, thank you for not flaming me!