He could not attack the upper classes directly, even though they offered big targets for satire.
In particular, their illusions about themselves, their pretensions of nobility and gentility, made them vulnerable.
In The Way of the World in the Act I itself it is revealed that Lady Wishfort organizes Cabal Nights regularly in which all the people gossip and critize specific people.
And in The School For Scandal the scandal mongering is the central idea around which the whole plot is weaved.
Something similar happens in The School for Scandal , Joseph wants to marry Maria just for the sake of money and Joseph Surface presents to be kind and generous in front of his uncle Sir Olliver just for acquiring fortune from him.
In both the plays most of all the characters portrayed are Aristocrats.
In both the plays there are Symbolic Names that is name of all the characters reveal something about their nature. Fainall pretends to be very different from what he really is so his name is Fainall-feign(pretend).
For example in Congreve's play the names like Lady Wishfort wishes for many things which are beyond her reach and thus her name.
Until the era of Wilde and Shaw, only Shakespeare’s plays had held the stage better than Sheridan’s. The two comedies of manners have fared better over time than have the two more specialized works, perhaps because their attractions are apparent even in printed form and perhaps because changes of taste have gone against the specialized works.
The topical allusions in In recent times, Sheridan’s reputation has waned: His “artificial” comedies lack the high seriousness that the modern age demands.