Yes, the family can do what they want once you’re dead, @Damntheman - however if they know you really don’t want a funeral, but they really feel they need one, they are stuck between a rock and a hard place. If they choose a funeral, they have to contend with the guilt of going against your wishes, but if they decide to honour your wishes, they are left with the pain of not saying a proper goodbye.
So - either way, they lose, at an already difficult time.
I can absolutely understand why people don’t like funerals, don’t feel them to be useful or helpful in the grieving process, and don’t want to be the centre of attention at one - but equally, I have been to a number of funerals, including close relatives - my dad, who dies very suddenly, my lovely MIL who died of cancer, and a cousin who committed suicide - and in every case, I felt that the funerals were a perfect celebration of the person who had died and gave comfort to those of us left behind. They were entirely positive experiences - not happy-positive - there was a lot of sadness there - but good and right.
Maybe what we need, for the posters who would hate having a funeral when they die, is something that isn’t a funeral, but allows their nearest and dearest some way to say goodbye, and share their happy memories - something that would be right for all concerned. It might mean a bit of compromise on both sides, but most things in life do, and it would be better than one side or the other feeling their views weren’t being considered at all.