Sending solidarity and condolences OP, as a veteran of several too many funerals across my 56 year lifespan x
One thing I have learned is that people can be extremely thoughtless and insensitive (self-centred), whether attending or not, and while one may forgive, completely forgetting is a whole other ball of wax, because grief is complex, eternal and unpredictable, and whether we like it or not, the devil is in the detail and can severely hamper the "grieving process".
Of note is the Mumsnet paradox, by which nobody has to do anything if it makes them uncomfortable / they have a better offer / it crosses their "boundaries" or they just don't feel like it, (obvious exceptions apply of course) versus lack of resilience / certain things are non-negotiable / puling oneself up by one's bootstraps and other clichés ad nauseam.
We are apparently going through a societal phase where virtually every previously universal and agreed upon custom or ritual is being dismantled, and expectations are nebulous, and fraught with conflict .
I live on hope that at some point the examination of such petulant questions such as "why should I?" and "why shouldn't I?" elicit some nuanced answers that include but don't pander to in ridiculous proportions, other people's feelings.
We have list the middle ground it seems in so many areas, and the need to be a maverick, announcing one's rebellion via social media etc is erroneously rewarded, regardless of impact.
Judging by some comments here, we may as well do away with the last vestiges of collective mourning altogether.
Not sure if this is peculiar to the UK, but looking at every other culture, current and historical, rituals around death persist and provide an important function for the bereaved. This attitude of being "over that" may well backfire. Nobody enjoys a funeral, because some poor sod has shuffled off, and the people that love them are very, very sad (yes, generalising because I know some people are arseholes etc etc). But it gives a sense of solidarity and the chance to process emotions - which may include over indulgence at the wake and making a tit of oneself. Because we're not robots.
As to the OPs SD - distasteful and poor form given the circumstances described, particularly the lying and social media aspects Sounds as if the rather lovely OP is going to handle it appropriately once the dust has settled.
Death sucks for the living. In so many ways.
Solidarity to all in the shitty club ❤️🔥