First, that does not mean that they are wrong. Rarely is there any one best way. What we do works for us. We can hope that what they do is working for them without hurting anyone else.
Second, maybe they are learning and trying something that is new to them. There is a learning curve. Someday they may be as good as, or better than, you.
As long as the other person is not doing you any harm, be tolerant.