The statement above pertains to clients and trainer's. As a trainer you're walking a tight rope at times, whether to be diplomatic or tell it like it is. Most of us can't handle the bare naked truth, and quite frankly it's hard to dish out, unless by nature you're an ass hole.
I've known a few people who actually get off on being A-holes. Admittedly I've envied them because it seems so freeing. But when you're a trainer dealing with clients sometimes who come to you with more baggage than a 747 jumbo jet you gotta use some tact, otherwise you'll be training yourself, or other ass holes.
Overall in my three plus decades in the biz, I've had a great clientele, but then there's been that small but challenging group of clients who have tested my resolve. Part of me took it as a personal challenge to see if I could turn them around, making them productive. The reality here is that some people you just can't reach, but that doesn't mean a trainer shouldn't keep trying, because that's exactly what they should do.
No matter what, your job as a trainer is to provide a client with all of the necessary information for them to succeed, but they have to be willing to participate, otherwise you've done your part. In some cases throughout my personal training career I've had to sit down my client, and let them know they are better off somewhere else, because they're wasting their time, money, and energy.
That talk most of the time is a defining moment for trainer and client. Trainer either looses a client or gets a client who pulls their head out of their ass and become one of their best clients ever. Know this trainer, your career is based on your ability to produce and reproduce results for a wide range of people. Remember, you're only as good as the last time you've produced results, and if you can't handle that truth, you're wasting your time, money, and energy.