late to this party and offering a lazily prepared post. here goes.
as a part time professional sound engineer (part time in that 25% of my yearly income is working with a sound company or IC small events) - yes, when you encounter one of the 10% please give him/her praise....and when you encounter one of the 10% on the other side of the equation either a) attempt to work WITH them, or b) don't take another show they work. when you work with the remaining 80% - find a way to have them in the upper 10% when you are working with them. and the figures are supported by research and behavioral science, not directly taken from live sound reproduction but a good generalization across all business. 80% of people in any business/social setting are the everyone's. no real issues.....10% rise to the top....and the remaining 10% give you 90% of your problems.....cut them from contact on sight.
stories to support:
as a hobby musician (maybe 10-15 paid gigs a year) - i've been to a few events engineered by other regional 'talent' and from observing behavior, listening to the product, and being uninspired decided for the few times a year i play it's not worth stepping into THEIR environment.
i took a nice paying opening spot for a private party and had a local sub-par personality, and ignorant to mixing sound professional tell me how it goes. the kid was unprofessional, insulting, arrogant, and disconnected from wanting to be there - before we even stepped on stage to plug in (all di, nothing on stage but 3 bodies, 3 instruments) we played our set, walked off stage, told the kid who never touched a fader while we played that i was disappointed with his attitude first and foremost and would never step on a stage he provided reinforcement for again, no matter how high profile or what the pay.
(by kid i mean younger than my years in the industry, not saying anything too derogatory or overconfident)
you could consider a similar approach - at the end of the day the company we keep isn't worth it.
when the most recent band i worked in found the right sound professional - we hired him as our exclusive engineer. we got first priority, he got all of our bookings, and when his fees increased ours stayed the same. we tipped him. we arranged for him to drink on the band free tab, we fed him as a band member. we even helped him load in/out. a good guy to work WITH
from the engineer side: we LOVE praise. i've had more than one band take a moment to thank me and point me out to the crowd during a show - at FOH and at monitors. seriously, running monitors had a band ask me to stand up, step onto stage, and get a round of applause to me.
foh at a jazz gig with world touring musicians, members of the audience waited in line to thank me for delivering a sound they appreciated. more than 2x the number of people came to me than to the band.
only two examples of something that happens routinely not just to me, but for the 6-8 other guys in the company i work with most often. not a single jerk in our crew. some of the younger guys have 'stubborn' mix preferences, but at the end of the day when we know what the band wants to project, how our gear works, and how the person paying us at the end of the day wants the show to come off....we'll work our ears off getting it better than right. now we have some good resources at our disposal (the elders in our group have decades of touring experience working with A acts).
the B and C acts we work with have a blast, get great equipment, and sound incredible whether they bring their own engineers or use one of our top dogs. the A acts love the gear we provide and tech for them, and 80% of the time deliver a great sound to the audience
at the end of the day, when anyone does something better than expected, they deserve praise and we are morally obligated to acknowledge this....even if it's the high school kid at the grocery store who takes the time to ask you name and comment on the shoes you're wearing and how rad they are.
keep bitching about people not being what you want and you'll get more of what you don't want - that's the law of attraction at work.