I really genuinely don't see the point. Yeah, it gets old when people talk about kids and ask you about it (especially when you made a desicssion to not have them), but that does not hurt my feelings. Not in a way that I would have to go around telling them to "stop preaching" etc...

Everyone around me at around 28 years of age started having a kids and guess what: our coffee talks started to revolve around parenting quite a lot more...

Makes sense since it is literally the biggest experience/thing in life for them at the time. I don't care that much - I either join in or just wait a while for another topic.