Hurt feelings

Hi there. I’ve been in SCS for six months now, and I have really grasped the notion that no one else can hurt my feelings. This was a HUGE revelation for me. My problem is…. not everyone else in the world understands this concept (smile). So, do you have any advice on how I can respond when someone who has no exposure to SCS or this concept says to me, “You’ve hurt my feelings.” Me trying to tell them that it’s only their thoughts, and not my words/actions only seems to make them more upset. I do try to acknowledge how they’re feeling, but I’m having a hard time sincerely apologizing, as now I see it’s their thoughts (and not me) that are hurting them. This is pertaining to an intimate relationship that I do want to continue. Thank you in advance for any insight/advice you can provide!