I’d not make a big deal of people making silly comments. Just tell them you’ll get in a relationship when time is right as right now you are busy with other stuff. I don’t think it’s NPD issue as much as in general people like to give others unsolicited advice. We can all relate to that. I don’t think it’s a big deal or really that complicated or tragic. Just tell them you are too busy or aren’t ready or are considering it or just tell them to mind their business.

I am not sure why you think it’s a positive thing disregarding people over mundane comments and with no regrets to boot. I’d not look at it as a good thing. I hope you keep working with your therapist.