Other versions of this are: That’s ridiculous. That’s ignorant. That’s unrealistic. You may not agree with the other person’s words, ideas or point of view. Nonetheless, you should always respect them.
When you say such words, you are probably trying to get the other person to see your perspective. Now think about how these words land on the other person. Will they be willing to listen? Not likely. And now on top of the difference of ideas, you have added disrespect unnecessarily.
There’s a better way. “I can see your point. I don’t think it is the best course of action because ….” “Your plan can be problematic and here’s why…”