I have started to reply to this 3 times and deleted 3 times. I just gotta say it: I agree, there are alot of very arrogant, self important artists of all kinds- it is just easier to find the photographers that aint got the chops cause their work is so easily compared to others work.
Every field of work out there has its share of people with that fake it till you make it arrogance, there is always some old age and treachery, some good old boy networks and lots of know it all experts. Photography is no different.
When I was struggling to get through school, I took all kinds of jobs. I met arrogant table busboys, self important gas station attendants, and guys that thought they were the worlds greatest school custodians. Some people just can't get any pleasure out of being good at something unless they can be the best, and some of those guys think that the only way to be the best is to tell everyone that they are the best.
It's a problem best solved by distance, as in keep walking, turn away and keep moving, or in some cases run. Whatever you do don't let it bother you, and rest assured that when skill really matters, when it's life and death, the government steps in and administers tests for your protection. Hire journeyman electricians that are licensed and bonded, get your car worked on by certified mechanics, go to a doctor that has a diploma on the wall and make sure your lawyer has passed the bar exam. But if you are hiring a wedding photographer, all you can do is look at their portfolio and if it just doesn't stand up to be as good as they think they are, keep moving. fast.
It's just like any other profession, but with apologies to all the truly great pro photographers out there that might read this, it aint exactly rocket science and it definitely isn't life and death.