People love to give advice – especially when they see that you are doing something different or working a specific way. They think they “know” how to do it better, and they want to tell you all about how you are doing it wrong, how you should change it, how your current plan is not the right way to do it.
Ignore those people. They aren’t interested in your results. They aren’t interested in your well-being. They are interested in their own ego-boost from putting what you are doing down and building themselves up.
If you are working a plan – mine OR someone else’s – the best thing you can do is listen to your trainer. Stop listening to the idiot personal trainers in the gym that barely know what they are doing – work the plan, get the results.