That's not true - if your goal is to change minds or address a standpoint, treating the position fairly and giving a smart, reasoned, and respectful response to a charitable interpretation of your opposition's standpoint is the BEST way to proceed forward.
Were this universally the case, creationism would have ceased to have adherents several generations ago. Therefore, I submit that your position is only true for rational positions reached and held by rational people who are willing to be convinced by rational discourse.
"Why can't we launch waste into the sun?" doesn't really signal irrationality. If they prefaced it with "I believe the earth is 6000 years old and I wonder..." then maybe you'd have a point.
