The freedom of speech means you can say whatever you want whenever you want, BUT as a rational human being, you need to think first:
- Is this good to me and the people around me?
- Will I be hurting someone or myself, if I say this?
- If I say "this" or "that", will I be helping to construct something or to destroy it?
- Is this smart or just non-sense?
As you can see, a lot responsibility comes with a tongue. Every person should always think first, before saying anything. If what you would like to say complies with those and any other good considerations, go ahead. If nothing good is to be said and will come out of that, than is better to keep it to ourselves.