Unrequited Love and Pining: Romeo's obsession with Rosaline is portrayed as a case of unrequited love, where he pines for a woman who is indifferent or not interested in him. This aspect of his infatuation is seen as humorous and foolish, especially in contrast to his later passionate love for Juliet.
Exaggerated Emotions and Expressions: Romeo's expressions of love for Rosaline are often over-the-top and exaggerated, making them amusing and parodic. His descriptions of her beauty and his feelings for her are so intense and poetic that they become almost comical, highlighting the absurdity of his infatuation.
Rosaline's Character: Rosaline, by comparison, is portrayed as practical and indifferent to Romeo's affections, reinforcing the humor in their relationship. She is almost a caricature of an uninterested love interest, adding to the comic effect.
Comparison with Juliet: When Romeo meets Juliet, the depth and genuineness of his feelings for her make his earlier infatuation with Rosaline appear even more frivolous and superficial, thus highlighting the comedic aspect of his initial attachment.
Benvolio's Teasing: Romeo's friend, Benvolio, often teases and mocks Romeo for his infatuation with Rosaline, further contributing to the humorous portrayal of his feelings.
The portrayal of Romeo's infatuation with Rosaline as comic creates a contrast to the tragic love story that develops between Romeo and Juliet later in the play. It also adds an element of lightheartedness and humor to the play before the conflict and tragedy unfold.
Overall, the infatuation with Rosaline serves to establish Romeo's character, his emotional state at the beginning of the play, and to make the transition to his more intense and meaningful love for Juliet later on.