Holier-than-thou

I don't like his holier-than-thou attitude.

Source: tatoeba (286975)

[T]here are local jealousies and disunities which are not likely to be soothed by the patent fact that companies which most strenuously assert the I-am-holier-than-thou claim daily violate the rules by which they profess to be invariably governed, [...]

Source: wiktionary

Hippolytus is quite insufferable in his endless protestations of pity and purity. One tires of such abnormal goodness and wishes for a little natural depravity. He is a perfect type of the "holier than thou" individual whose secret heart is a very stagnation of egotism, selfishness and disregard for others' feelings.

Source: wiktionary

His garb is such as any gentleman might wear—a farmer, a thrifty mechanic, a teacher, or a plain business man—a brown slouch hat, any kind of a simple necktie, any kind of a coat except the unctuous holier-than-thou broadcloth with the front full of button holes.

Source: wiktionary