I am of the opinion that if you like a group a lot, do NOT leave because one person hurt your feelings. Coming back after such an insult shows class on your part. If the person coninues to be offensive, perhaps you can tell the person very politely,” Ihave always thought well of you – why would you say something mean-spirited like that?” That will usually stop them in their tracks.
And it is correct – if someone embarrasses you b’rabbim and you remain silent, your next move is to give brachos to people, because Hashem is especially predisposed to hearing these brachos from someone like you in that moment.