Enjoyed your pod cast - on vendor relationships - especially thinking in terms of boss and subordinate. I always treat our vendors with respect - a few years back I needed a part turned on a Sunday morning for an emergency - my long term vendor went to work and did it for us.
But what do you do about evil vendors - unless you are a big company - all of the major shipping firms treat you like dirt - just an example if they damage your shipment - or lose it - before they will even entertain your claim - they demand you pay freight charges in advance.
Had the same problem with one of my favorite vendors - who we even praised in press releases - and then they got bought by a bigger firm - their terms went from net 10 days to PIA - quote times from 1 day to 45 days -delivery times 6 weeks to 6 months and the terms were the most adverse I've ever seen - including delivery whenever they want.
The answer is to replace the vendor - but sometimes this is not possible.