Alow me an observation from the other side. I am a parent and I’m friends with two childfree couples (as well as with several other couples that don’t have children now but plan them in the future). I meet my childfree friends when I have someone to babysit, so I have a free evening for them. Sometimes we spend holidays together and on those occasions they don’t mind the children. In general, they choose the activities they want to participate in with me and it doesn’t influence our friendship at all. In the end, I think it’s about mutual respect (and finding people that are capable of it).