Inappropriate laughter is not the greatest of crimes in terms of karmic penalties. Laughter has a place, there are humorous things seen and felt and experienced by light beings, and by Creator to a somewhat lesser extent, but at least the capability to see what might be considered humorous in an event is nonetheless present and enjoyed after a fashion if not through laughter per se. As we have said, laughter is an outlet for tension and it is better to release tension than to bottle it up inside and live with it. It will cause other consequences if not given an outlet to discharge it safely. But if that discharge is at someone else's expense, in the laughter being directed at them in a way that is belittling and hurtful, that will be a karmic penalty and will be duly noted, and the Law of Karma will return that negativity to those having a laugh at someone's expense because it will become their expense eventually, as well.
We have already explained that light beings do not see the same things as funny as beings in the physical, so it is a quite different kind of experience and not done in a way where anyone loses something. That is not true of the physical plane where laughter is often the privilege of an elite group at the expense of others less fortunate, less in the know, less capable, less experienced, and perceived as less competent as a result. This is often something that becomes a kind of prejudice where people feel those who are less adept at something are lesser, and looked down on, when it might simply be a difference of their basic makeup and choices to become skilled at other things and not where those judging them feel are more important abilities. But that is an arbitrary judgment to begin with and so there will be a karmic misstep in judging others inappropriately. The level of karmic liability will be a function of the harm done. As is always the case, the Law of Karma is quite precise in meting out a consequence in proportion to what is not in divine alignment because the aim is to restore a balance. It would be better if people had greater insight and a greater sensitivity to the needs of others, to put themselves in their shoes and be more tactful at least, in understanding that people can be vulnerable and even oversensitive if they are less able to do things well.
Many times humor directed at others is not only hurtful but can be an intentional weaponized maneuver to hold people up to ridicule, and that purpose is to diminish the "losers" and benefit the perceived "winners" in a contest that may only be something in the minds of individuals with big egos thinking they are better and judging others for trivial differences, and thus lowering themselves without realizing it, in ways that greatly outweigh the assumed superiority of their greater competence. Again, these are cultural attributes manipulated to be ever-present, and are used as tools of manipulation in the strategy of divide and conquer so there are always ways to pit people against one another and to manipulate them to pick winners and losers in everything that happens, and what happens is, under those circumstances, all end up being losers because the world is lessened in operating that way so much of the time.
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