You have no idea what is going to piss somebody off. For some, it's the fact that you are breathing. Who knows? Life isn't a Disney flick, where we all wind up happily singing and dancing through a final big production number. We are flawed, emotional critters. So chances are that you are not going to agree with the guy across the street. It takes lots of tact, patience and luck in keeping the focus on the disagreement and not the disagree-er. The best course is to try to remain friendly with your neighbor. And really, does it matter if you differ on the EU depreciation laws?
As far as FB is concerned, you can't rise above the emotional maturity of third graders?