If you want to state your opinion then state your opinion without an attack. Say, "I don't agree" or "I feel the situation is more complex" because when you mount an attack and call someones' idea "ridiculous" you better back it up and make your statements solid.

Every statement you made was harsh, negative and unjustified. You deliberately mounted an attack without evidence. Without evidence you shouldn't attack anyone, with only an opinion all you can do is share it in a friendly manner.