You know the problem with being “self-righteous”....it has the belief that someone is actually “righteous.”
And you can’t be righteous if you’ve been trashing the dead. There’s no righteousness in any of that.
Point: even if you disliked, or hated the young man XXXtentacion in life, you owe it to his family at least to allow them to grieve him with dignity in death.
Simpler point: if you didn’t like the young man, use one of life’s first lessons about things you don’t have anything nice to say:
Shut the fuck up. No one asked you anyway.