There is another aspect to this scenario: consider the few, (and there are just a few,) like Bob and myself who perform as a duo but EVERYTHING heard is just us, created by us and mostly played live. Not a Karaoke duo performing to backings that are someone else's' creative work, and bought, or in some cases stolen on line primarily because they are not capable or too lazy to create their own.
For so long now you could go to half a dozen country/western/line-dance or whatever venues and see different solo and duos all using the same tracks. Utter laziness or lack of capability is the reason, these are the ones who have damaged the music business the most, junk P.A.'s and bad sound mix combined with the aforesaid is having the most negative effect on gigs, not only in our field but all music genre's.
Personally I think that those who go out and play gigs with backings they've obtained by the "Beg Steal or Borrow" method are nothing short of Karaoke performers, if 'performers' can be used very loosely.
My own thinking would be that those type of 'Players' should stay at home and learn how to make their own backing and we would all then regain individual identities and become more proficient and entertaining.
I'd like to use David Hartley as an example here, you may wonder how he got to be such a world class player ! Well, firstly he has a VERY good knowledge of music and an extremely acute ear developed by intent listening. His backing are individually crafted works of art in their own right, he has reached out and grasped technology by the

He would be the epitome of a man crafting backings to suit what he wants to do, not adapting what he can do, to suit the backing.
There is only ever going to be a limited number of gigs available for all of us, and complaining about the lack of them is wasting time that COULD/SHOULD be spent learning skills pertaining to the job. This side music business is really the entertainment business and the entertainment side of the performance is what's lacking in so many that complain about no work. If the object of our playing is to entertain and please ourselves, we should stay in our "Weekend Bedroom Warrior" mode and venture out into the men's world when we can "cut the mustard".
The learning curve for dexterity on the majority of music technology equipment is not beyond most of us, and what should be looked at is how to use the tools to do the work.
I started with computers when the very first one became available to the masses, and have stayed abreast ever since, much to the detriment of my playing, which I'm certain would have been much better had I just stayed as a player with no other interests. I sacrificed the woodshed for the technology room and have always slightly regretted that. BUT, my foremost vision and aspiration was to entertain OTHERS..
This manifested itself in my building and designing recording studios all over Ireland and engineering and producing records for others, motivated by the wish to help others in their careers, doing it reasonably well helped my career also so that was a beneficial 'spin off'.
All that aside the subject here of "How do you challenge this type of thinking?' well. in a nutshell, you get better at what you do and learn whatever is required to make what you do 'Entertaining', be it to the audience or the band-leader that you impress.
Personally I think that before you knock others for using backing tracks you need to study how they are using them, and also try to assess who are the ones that are actually damaging the gig business. On Television, Videos and large concerts, backing tracks have been used successfully for many years, it's the abuse of them by wannabe's that has caused the partial demise of viable gigs.
I must admit that it is so refreshing to be able to have tunes in tune, counted in accurately every time and with all the right chords occurring, for so long being at the mercy of how much alcohol had been consumed by the drummer et al was the determining factor of the success or not of the performance was downright frustrating, and to have others being carried on my back just

me off. It caused me to leave the "band" scenario, it was the motivation for me to develop more intense usage of technology.
All my life I've had the philosophy of "Good Enough" is not good enough, and I've proved the point.
"How do you challenge this type of thinking?" you change yours..