If you're boss is negative and out of touch then theres a few things you can do!
The first thing you can try is having positive conversations with your boss to hopefully help their outlook.
If that doesn't work, you might want to do your best to protect your sanity. Trying positive practices like meditation, prayer, and yoga to renew yourself to better handle your boss.
Try to directly talk to your boss about how you feel, but make sure to be polite and respectful!
However, if none of this works there is still one option left. If you are able to and your boss is truly ruining your work life, you can always quit. After all, you shoudn't have to have your worklife ruined!