A few choice tidbits from Epictetus
If you are told that such an one speaks ill of you, make no defence against what was said, but answer, He surely knew not my other faults, else he would not have mentioned these only!
In company avoid frequent and undue talk about your own actions and dangers. However pleasant it may be to you to enlarge upon the risks you have run, others may not find such pleasure in listening to your adventures…To border on coarse talk is also dangerous. On such occasions, if a convenient opportunity offer, rebuke the speaker. If not, at least by relapsing into silence, colouring, and looking annoyed, show that you are displeased with the subject.
When Xanthippe was chiding Socrates for making scanty preparation for entertaining his friends, he answered:—“If they are friends of ours, they will not care for that; if they are not, we shall care nothing for them!”