Final answer:
Brabantio is scornful toward Roderigo due to his uncouth courtship methods, his social status, and his failure to be a desirable suitor for Desdemona.
Step-by-step explanation:
The scorn Brabantio holds toward Roderigo in William Shakespeare's play is due to Roderigo's perceived unworthiness and his persistent yet uncouth attempts to woo Brabantio's daughter, Desdemona. Brabantio is scornful toward Roderigo due to his uncouth courtship methods, his social status, and his failure to be a desirable suitor for Desdemona.
Roderigo's approaches are depicted as clumsy and his manners are likened to those of a bear, lacking the refinement and gentility that Brabantio expects for his daughter.
Brabantio's disdain stems from a combination of Roderigo's social status, his aggressive courtship methods, and possibly his previous failures to win Desdemona's affection, which collectively make him an undesirable suitor in Brabantio's eyes.