This may not be shared by other people, but my two cents.
I personally don't like inviting people to my house (or going to other people's houses) because I already spend a good chunk of my day indoors (I work from home). Whenever possible, I prefer to meet outside.
When I was growing up, a good deal of these sorts of parties involved backyards, barbecues, and swimming pools. Rarely did we spend time indoors.
I think the point of the article is more about meeting with others at all, as opposed to it specifically being at home. So hang out with friends outside!