Hmm. There are SO many things that folks can clash about: politics, religion, life philosophy, "lifestyle" (e.g., voluntary simplicity grounded in a radical green commitment vs "I want to drive a giant SUV and have three backyard swimming pools and a three thousand square foot house, electrically heated)....
And isn't is amazing how diverse we all are? I mean, wow!
Those are my two cents for the moment. Just the wow part.