Yep, you can boo him but all that does is prove your ignorance.
As an American, you should honor those who fought for your ability to boo someone. One of the people you should honor and respect is Ralph Wilson, who is a WWII vet.
If you want to boo Ralph and act like a moron, at least respect Ralph for his contribution toward your privilege of acting like an idiot, you ungrateful buffoon.