This is just my opinion but you strike me as a "I am on better than everyone and no one belongs as high as me" kind of person/DJ. Maybe that works for you but it sure doesn't for me.
There is a serious lack of comprehension here. I do not have a problem with Venues and other vendors, period. Why, because I do not deal with them as if they are my client. They are not! I request and obtain things on behalf of MY Client, the person who is paying me or who hired me.
I also don't allow anyone or anything to get in my way of delivering a stellar performance. I give Kudos where it is due. If I ask a waitress or Bartender for a glass of water or a drink, I will tip them even though the drink itself may be free. This is showing appreciation not sucking up.
If some DJs do not have the skills of interacting with others without making advesaries then that is their problem. I have formal people skills in Sales and Marketing and use it to my advantage. I have confidence in what I do.
My personality is one of directness, I try not to beat around the bush.