I realize that our guest bed is uncomfortable, but I don't care.
Do you think others think the bed is uncomfortable?
I'm sure it's not only me who thinks the bed is uncomfortable.
You should make your guests feel welcome and comfortable. If they don't like the guest bed, you should provide a better bed for them.
I'm not going to offer a better bed to anyone, this is my house not their home.
You should strive to make your guests feel welcome and at ease. Have you thought about doing small things to the current bed in order to make it more comfortable? You could add some extra padding, a mattress pad, more pillows, etc.