Spend any amount of time on the internet and you will come across self proclaimed experts. Arbiters of truth in their chosen area.
Fitness, finance, art… travel. Even for hobbies, people feel the need to tell you they are doing it right and you are wrong.
No experience. No authority.
Of course, it’s not unique to the internet, that’s just where people are provided feedback to tell them their opinions are worthwhile. This feeds them, they feel powerful. Get a few thousand points on your chosen social network and they feel like an expert.