Final answer:
The speaker is apologizing for swearing, as indicated by the warning to watch their language and a promise not to swear again.
Step-by-step explanation:
The speaker is apologizing for swearing. In the dialogue provided, it can be inferred that the speaker used inappropriate language, as indicated by the admonition "Watch your language and don't swear ever again". Additionally, the speaker's response "I'm sorry. I'll keep that in mind" suggests an acknowledgement of the misconduct and a commitment to avoid repeating the offensive behavior in the future. This apology does not directly address hurting someone's feelings, not listening, or being repetitive, but rather it is focused on the use of swear words.