Even when it's not meant to be judgmental, those kinds of questions can get old after a while. Then, add in the fact that the line of questioning often is judgmental and you'll frustrate even the most patient person.
It doesn't take an overly sensitive person to get frustrated by that. Hell, I got frustrated by the attitudes and questions, and I actually wanted (and now have) kids.
Nothing sinister here...
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.
Sensitive about it? I don't see where you get that impression from.