Except that, as you know, concepts as complex as fascism don’t have a universally accepted and authoritative meaning. Doing that google search suggests that some people, at least, disagree with you that the answer is as simple as you’re making it out to be. Moreover, as @skeptic’s comment suggests, this failure of a common definition is an ongoing problem. The meaning is dependent on context and subject to dilution by its use in bad faith.
That seems like it depends heavily on the purpose of the communication. If your purpose is to communicate only to people who have (at least roughly) the same level of education you have and who think (at least roughly) the way you do, then sure. If your purpose is to persuade, then using words that the people you’re trying to persuade understand differently than you do is misleading, ineffective, or both.
Think about, for example, the hand gesture that, until about 2 years ago, universally meant either “okay” or “three pointer,” but that now, according to some, means “white power.” Don’t we have some responsibility to take into account that third meaning when using (or not using) the gesture?
