I wouldn't worry too much about it. There are all types everywhere.
At the same beach I have met people that will talk to you for ages after asking them what size sail they were using, and others that eye you suspiciously thinking you are going to steal their rig!
There are kiters that will do exactly the same too, so I don't think there's much difference between the sports. It's a bit harder though as the only thing in common is the wind.
I guess when it comes down to it some people have poor conversational skills or don't want to talk, and some do want to talk.
Keep trying to talk though, you might meet some nice people and it all makes the sport more fun. The only problem I have is when someone tries to talk to you for ages when you have just finished rigging up and they have just finished for the day...