Some people will always criticize you on your training methods, the tools you use, or how you handled a particular dog and so on.
It can be very confusing for a client who has spent a lot of money on training just to hear afterward from another trainer that this trainer is not good (e.g. he used punishment, or his dogs will only listen when there is food...etc).
For owners who are trying to train their own dogs, with so much conflicting information out there, they will often ask themselves which method should they use and wonder if there may be any negative effect with what they have chosen?
I understand there are many confusing and conflicting information out there. Everyone wants their dog to receive the best care but it can be very difficult to choose the best trainer just like it is not easy to find a good vet.
You may have read that certain tools are abusive and are worried that your dog will suffer if you use those.
Speaking from what I have seen and used personally, it is my opinion that if a tool is used properly, it should enhance the relationship between you and your dog--be it treat, halti, harness, prong collar, slip lead, remote collar...etc.
So, next time when you hear someone saying so and so is not a good trainer, or such a tool is not good, my recommendation is to reserve your comment until you have looked at that trainer's own personal dogs, and the dogs that he has trained. Watch with your own eyes and ask yourself if the dog looks shutdown, scared, or does it look happy, motivated, and well tuned in.
Behavior does not lie. Great trainers have great trained dogs. Also, great trainers are usually too busy training dogs to attack other trainers, they just let their dog's behavior speak for themselves.
The behavior of the dogs is better than a thousand words and should help to take the confusion away.