Ignore your neighbor. Marcus Aurelius 4.18

Life offers limited opportunity for action. Don't waste precious time chasing the suspicion that your neighbors are wicked. Make yourself good instead, and you will enjoy leisure (instead of using it to harm your mind with constant irritation at the wickedness of others).

Ὅσην εὐσχολίαν κερδαίνει ὁ μὴ βλέπων τί ὁ πλησίον εἶπεν ἢ ἔπραξεν ἢ διενοήθη, ἀλλὰ μόνον τί αὐτὸς ποιεῖ, ἵνα αὐτὸ τοῦτο δίκαιον ᾖ καὶ ὅσιον ἢ (†) κατὰ τὸν ἀγαθὸν· μὴ μέλαν ἦθος περιβλέπεσθαι, ἀλλ’ ἐπὶ τῆς γραμμῆς τρέχειν ὀρθόν, μὴ διερριμμένον.

How profitable the leisure of a man who doesn't care what his neighbor has said, or done, or thought! Instead of looking at that, he considers only what he does himself, seeking to make it just and holy, or at least in keeping with nobility. Don't waste time scanning the horizon for dark clouds of wickedness. Instead, run a straight course down the line marked for you, refusing to deviate or be turned aside.

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(†) This passage is marked by editors as corrupt.