Egocentricity

Behavioral problems in autism are a daily occurrence. Undesirable behavior usually implies confusion in the child, which often is a result of a situation that the child doesn't comprehend.

The are multiple reasons for this.
The child being self-centered creates a lot of stubbornness and they vehemently insist to achieve what they have in mind.

Many times the child cannot verbally express his desires and that creates frustration both for themselves as well as their parents.

Anxiety and stress in the parent (and adults in general) are insufferable for the child, resulting in offensive behavior.

Nutrition and diet also play an often underappreciated role in the behavior of a child.

These four reasons usually seem to be intertwined. A situation often comes about where the child loses all control. There are moments when they need to stop some undesirable behavior and the parent sees no other solution but to use force (verbal or physical). Many a time, it seems to us that there is no real reason for a situation to turn into a drama and we wonder how the child can be so insistent.

Egocentricity
The child insists too much for certain things and doesn't take no for an answer. That is not the child's fault, it's merely the way they function when they have yet to develop basic sociability. When we implement a program of therapeutic play for at least a few hours per week, their reactions quickly become much milder and they begin cooperating at an ever increasing rate.
An additional advantage of such a program is that the child plays with someone in a room where they have total control. In that room, anything they desire happens and nothing that could upset them occurs - a paradise! Moreover, sociability is nurtured in them as we have greatly simplified the process of communication. At the same time, the parent is free to feel calm and recharge, which is important because accumulated stress and anxiety decreases our productivity and endurance levels.

In order to achieve these goals we need to use a few tactics:
It is important for us to predict the child's reactions, to the best of our ability, so as not to create needless confusion. For example, if the child creates problems at the supermarket, then it's safe to say they have not understood that we do not buy sweets every single time. Our explanations obviously do not yield results. Thus, it is wiser to avoid the situation altogether for the time being, as negativity and shouting do not bring about an improvement in their behavior.
If the child has flight tendencies, then we should make sure that all doors are locked. Here, the anxiety that a parent feels for the possibility of their kid leaving and getting lost has a much greater effect on the child than the possible negative feelings that these restriction might bring upon them. I do believe, however that the parent's fear of their child feeling locked up is a main reason why they keep wanting to leave in the first place. We can avoid many situations to avoid upsetting the child. It is a matter of respect towards them.
The autistic child reacts badly whenever they are denied something, because they do not immediately understand that "no" does not equal "never". It's possible they don't even register phrases like "in a bit" or "not now" etc. The only thing that gets through is that they cannot do what they want, which they deem a catastrophe. If the kid really wants something at very inconvenient moments, like a walk to the park, it is very helpful for them to literally see (ie presented in an optical manner) exactly when that will happen. If they realize that their desire will be fulfilled at some moment in the future, they will have the patience to wait.
If we implement a routine on a daily basis, the child will be much calmer, since their life will flow more predictably. For example, we go to the park at 17:00, we go to the supermarket only on Saturdays etc. We can display their daily schedule so that they know exactly when everything will happen and won't feel the need to make requests at unsuitable hours.