I don't really have any advice to offer with regard to this. But I just thought I'd say I think you're right. Be friendly with those who are friendly & ignore the rest. To my way of thinking at least, it's like being back in school. You're either in with the in-crowd or you're not. And if you're not (I certainly never was) you're not going to be no matter what you do or how hard you try. So, from my perspective, it's probably best not to try to begin with. At least those are my thoughts.