Idealization does not occur when you have an idea of how the world around you should be. But only when, on the basis of this idea, you began to feel irritation or any other negative emotion.
To idealize means to give excessive importance to some model of the world, i.e. to feel any negative emotions in a situation when the real world does not coincide with this “ideal” model (to hate, be jealous, resentful, etc.).
Let's say you have a strong belief about how your life should be (some “ideal” model of your life). Comparing this ideal model with your real life, you see significant discrepancies and begin to worry about what is happening in reality. As you begin to worry, you begin to accumulate sins.
Idealization occurs when you have in your head some significant model of how your husband (or wife, child, acquaintance, boss, authority figure, etc.) should behave. You know how he should behave. And he behaves a little (or quite) differently. That is, he does not correspond to the ideal that exists in your mind. So you get aggressive and try to get him to act the way you think he should. Or you fall into sadness or despair that he is not behaving properly.
In both cases, you do not accept this person (and through him or her, the whole world) as he or she is because he or she does not conform to the ideal that exists in your head.
It is possible to idealize not only individuals, but also situations in the world in general. For example, the government is acting wrongly and leading the country to a dead end. Democrats have forgotten about democracy, and communists have forgotten about the problems of the people. A worker in my profession is paid too little, others are paid unreasonably much, etc. And there is a huge number of such idealizations that so poison our lives.