I might be misunderstanding what booing means then. My understanding is covering another person's voice with shouts in order to sabotage his speech. It might indeed be part of what some society might define free speech, but I'd consider it more of a coward form of violence.

If with "booing" you mean "disrespect whatever good idea a person has because it also has very bad ideas", then I wonder who we will end up respecting. Even I have ideas I end up discovering bad. Should I boo myself and ignore everything else I say?

If I am missing another definition of booing then I am sorry.