if you are being antisocial to the grid by installing solar at your house, they can pay you less for the electricity you are generating than they charge you for the electricity you are consuming
This is only a problem when you produce more than you consume, which doesn't happen in price-conscious households with properly sized PV systems.
they can charge you less for electricity when you aren't there during the day to use it
Actually, they charge more during the day, when air conditioners are running and businesses are operating.
Coincidentally, this is also the time when solar energy is most productive. But flat rates counterproductively discourage people from putting up solar panels and reducing the strain on the grid.
even with huge storage capacity, there's no way you are going to be able to recharge your car while you are asleep
When solar makes up close to 100% of daily energy production, you will have a point.