It is mostly evident in the manner in which every Victorian "polite society" value and members of such highly-idolized group are mocked by being portrayed at their most exhuberant, excessive, mindless, and unintelligent.
The topic of marriage is mocked by the money-hungry ways Lady Bracknell, and the midnless dreams of Gwendolyn and Cecily.
Money is mocked through Algy's extravagance and lack of funds, hence, putting him as a person who lives way above his means.
Truth, honesty,civility and sincerity are mocked all over the play in the two-timing characters of Jack and Algy.
In all, Earnest tells us from the title to the end that this play is indeed a satire.