How bad would it be for a motercycle to just let it sit for a year? I have been told this will destroy the bike. Any truth to this?
No, zero truth. Motorcycles last many many many years. It is not uncommon for a "used" motorcycle to sit at a dealership for many years. Even a new bike can sit a year or more in the showroom.
Did you really just ask this question? Is this actually you or have you been hacked?
Letting gasoline sit in any carburetor for one year can gum up the carburetor and fuel filter and the tires may need to be replaced. After a long long time the seals in the shocks will need to be replaced. But everything else will be just fine.