You are not exerting a force rather, you are having an influence as a result of the choice of a human being reading your passages.
Unlike the result of a force the response of people to the influence of your statements is a choice that they have. All that read these lines are not required by a "law of nature" to answer back. You are confusing the science term of "force" which is defined as a mass acceleration with a colloquial term concerning influence or persuasion in a conversation.
This is purely a matter of perspective. You are quite mistaken if you think I am confused. I understand the perspective you and others share quite well. I understand exactly what f=ma represents. It is no more a definition of the phenomenon we call force than your height is of you.
F=ma results in a measurement that is the property of a phenomenon we cannot define. We are aware of the result of force but we have no clue what it is. One does not discover a means to determine the mass of a substance and then declair that is the definition of the substance. This is absurd. It is no more absurd to think of force in the same narrow way. It is an artificial limitation placed upon a thing we know little about.
Science has found a predictable quantitative property of a phenomenon they cannot explain. This property can be exploited. It has proven very useful. We can be very predictable as a whole from a statistical point of view.
All that read these lines are not required by a "law of nature" to answer back.
Statistically as a whole this is an incorrect statement. People will respond. This response is a part of nature. We evolved this way. This is a property of us.
The difference between your narrow view of force and mine is that you can measure a property of the subject. The mistake is that you define the subject by a property. I cannot currently measure my idea in the same fashion. We understand a number of properties of ourselves in a very real way but not measurable in the f=ma way at this time. We are a different animal so to speak but the fundamental idea is what I am driving at.