Patada

No group is worth joining if everybody is welcome. Jim Grimsley

Por sol, Barra, Aveiro

For example, we feel a slight disappointment when we hear a close friend, whose spontaneous gestures of warmth we felt were our own preserve, talk intimately with another of his friends (especially one whom we do not know). An explicit statement of this theme is given in a nineteenth-century American guide to manners:
If you have paid a compliment to one man, or have used toward him any expression of particular civility, you should not show the same conduct to any other person in his presence. For example, if a gentleman comes to your house and you tell him with warmth and interest that you “are glad to see him,” he will be pleased with the attention, and will probably thank you; but if he hears you say the same thing to twenty other people, he will not only perceive that your courtesy was worth nothing, but he will feel some resentment at having been imposed on.
The presentation of self in everyday life - Erving Goffman