Is it bad for your car to drive it only once a week or even more seldom?

The car is a Honda Fit 2013

No, not really. So long as you operate the vehicle somewhat regularly, enough to lubricate parts and allow belts to heat and flex, then there should be no worries.

You need to turn the car on periodically so the battery can charge. You do NOT have to drive it. The tires can dry rot.

When my car was not driven or turned on for more than 5 months because I was in a hospital or nursing home, the car was dead and had to towed to get it related. I don't remember now if that included batting a new battery. I had to replace 2 tires because of normal wear and tear.

No it's not bad at all. I have two cars. One for short trips and one for carrying stuff on long trips. This means either can can stand unused for up to three weeks. No problems result.

When I worked as a truck driver my car would be parked for two weeks at a time, just driving home and back to work between trips, 10 miles each way

Get a trickle charger for the battery. Change the oil at least once a year or every 6 months. Take the car for a long drive at least every 3 months. Your car will be fine.

Yeah. It will take one longer to find out just how much his car is a piece of zhit.

No. It is not bad.

That will be fine.