"The main thing - treat people with respect and you can avoid most of the problems this world has to offer." The flip side is if you don't treat people who disagree with you with respect - you are creating a whole new set of problems.
Good advice, especially this bit; "Reducing your exposure to the kind of people who obsess over the opinions of others will be key if you find yourself going the wrong way. If you can't help but become incensed by the opinions of others, stop consuming so many of them. Avoid being part of the peanut gallery."
Treat everyone with respect. Get off Facebook and read a book or go for a hike in nature. You'll be a better person for it!