I'll speak in generalities, combining my own experiences with those of others I know or have heard in academic studies, support groups, etc.
1. Kids are cruel, especially young kids. ANY negative distinction in elementary school is likely to cause at least insults, friction, etc. This then snowballs to the later problems I mentioned. It has a boomerang effect of also creating more negative behaviors in the individual as they suffer each round of increasing abuses. My own frictions started in 1st grade, and by 5th grade were firmly established as a fact of existence.
2. PEOPLE are stupid, and evil, even if the individual people aren't. Groupthink is pervasive and mighty. While individuals you know might never knowingly do something intentionally cruel, when they are in a group (or merely join their power to a collective force) they usually lose such inhibitions and begin acting out of egocentrism, often with violent or at least negative impacts.
3. Small towns (up to say, 100,000 population) are NOT society as a whole. They are bare-faced microcosms of human nature. Anything that happens in a small town is known by all, and will be remembered for at least decades. I am still told from time to time - "Hey you're the kid that wouldn't say the pledge" or "You're the kid that got kicked out the Scouts during the oath" or "You're the guy that wants everyone to carry guns" or "You're the guy that hates America" or whatever. Yeah, I'm outspoken and have always been a part of the campaigning and public awareness aspects of various causes, but I'm not the only one that this stuff happens to. It's a global small town phenomenon.
4. Many, if not most, places I've ever worked have at least one religious nut, if not an overt environment of religious overtones. Merging of church functions and work cliques, invoking God for various reasons - even in official practices, asking for or offering prayers for various reasons, etc. Combined with the small town 'everybody knowing everybodies business' it means anyplace you're going to work will know your beliefs. Mind you, this isn't as true at very large places of employment or national chains, but it still happens. Many even make religious principles part of their business creed.
That's just off the top of my head.