The other crushing thing about caring for someone with dementia, is how it utterly destroys your memories of them.
If you, like me, are prone to rumination, I would think carefully about just how much care it's good to take on.
Listening to their crass and hurtful comments once is bad enough, but replaying them over and over looking for a meaning or reason, when the truth us there is NONE, is enough to make the best of us utterly miserable.

Take care of yourself hun, just take it one day at a time.