It's simple, really;
1. Never assume experience or authority mean that someone knows what they're doing. Everyone makes mistakes, even those with years of experience. People drawn to power and authority often exaggerate experience or credentials.
2. Ask questions. Never be afraid to question anyone. If anyone tells you asking questions is wrong, walk away. This is unhealthy behavior.
3. Pay attention to how criticisms are handled. Deleting comments is a big red flag, as well as blocking and lecturing anyone who disagrees.
4. Look for personal attacks in response to someone who challenges their ideas. Some people can't debate and choose to attack the person instead. Another red flag.
5. Just my opinion is a deflection. Everyone understands that blogs are opinions. The moment you choose to publicly state yours in a public forum, that opinion is up for debate. Simply saying something is your personal opinion doesn't make it unquestionable.
6. Look for people that can and do engage with others and admit mistakes. Avoid those that don't engage with critics or attack them consistently.
7. If you see something wrong, say something. That's just your opinion too, and someone may disagree. If they can avoid the pitfalls above, I promise you you'll both gain understanding and respect. Predators thrive when they go unquestioned.