Many still believe in feng shui and that won't change. If they've grown up with that belief and think that it's very applicable to their lives, nothing will change.
As they live continually, that will be the belief that they've got because it's a matter of how they've seen the effects of it. They won't mind what the others are going to say because it's so effective for them and they've seen the belief of its good result.
Maybe they must adapt to their surroundings if they are still using Fengshui because other people will certainly not know or use it either. Thus, their lives can be in harmony with their surroundings and there will also be no problems arising. Other people will also not say things to them because the other person will not know what they are doing.
There's no need for others to know it if they don't know it unless they want to apply it to their lives and try it. There's no need for them to adopt the surroundings IMO and that's how they get used to what they do and as well as get used to the surrounding that they're living with.
It's all about what they used to do and believe and so the others too, that's how they're going to live and deal with the others as well.
At the very least, they must be able to adapt to their environment before they can adjust to their wishes. If they don't, I'm afraid there will be unwanted friction and it could end up causing something bad for everyone. If they can follow well, I'm sure nothing will happen and everything around them can also get better so that the environment will slowly change into a good situation. We don't want anything bad to happen either, right?