I've not been to any of the card games, but have been at the pool where it looked as if people were ignoring others only to find out they were ALL new and just shy.
I don't know if this is the situation, but sometimes people just don't always know how to "break the ice".
In my neighborhood we are all working to find common ground and sometimes it comes easy and other times it doesn't.
I'm sure given a little time and patience, it will all come together.
I hope your friends have better time of it at the next game.