The poet uses unsentimental dialogue to contrast the father's later concern for the speaker.
Sentiment, better known as emotion, is a broad concept of an experience that is often perceived as positive or negative. Emotions can, for example, include an attempt to communicate something, in which case facial expressions are included as a consequence of the attempt. An emotion can also contain attempts not to show their experience.
Another example is action, where certain emotions only differ in degree of action, where high heart rate and butterflies in the stomach can be experienced as either anxiety or exaltation depending on the degree of action (belief in one's own ability in the situation) and more. Emotions thus often include both own experiences, physiological changes and behavioral tendencies (often facial expressions and body language).
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