to be quick to criticize others while ignoring one's own, generally greater, defects; people who live in glass houses shouldn't throw stones

to beat one's head against a stone wall

(idiomatic, vulgar) to have a bare-faced cheek

the apple doesn't fall far from the tree

to bite the hand that feeds you

truth will out

what's the matter with you?

Synonym of la gatta frettolosa fece i gattini ciechi / Synonym of presto e bene non vanno insieme / Synonym of chi va piano, va sano e va lontano

to get up someone's nose, get under someone's skin

(idiomatic) to cut one's coat according to one's cloth