Tybalt reacts aggressively towards Romeo at the party due to the feud between their families in 'Romeo and Juliet'.
Tybalt's relationship with Romeo affects his reaction to Romeo being at the party as he believes that Romeo is there to insult his family because of the ongoing feud between the Montagues and Capulets in Romeo and Juliet. Tybalt's aggression towards Romeo stems from the deep-seated animosity and rivalry between their families, leading him to see Romeo's presence as a direct challenge.
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