Please be careful. It could be that his thoughts are excellent but his communication is flawed. It could also be that he has a great deal of general expertise in the subject but is mistaken in this specific statement.
Thus, a general statement about him could be false is also aggressively ad hominem. You might want to consider focusing on the statement itself rather than the speaker, such as:
"Your suggestion is entirely wrong."
JM2C of course, and it is possible that I don't know what I'm talking about. I am not a psychologist or a logician.
Please be careful. It could be that his thoughts are excellent but his communication is flawed. It could also be that he has a great deal of general expertise in the subject but is mistaken in this specific statement.
Thus, a general statement about him could be false is also aggressively ad hominem. You might want to consider focusing on the statement itself rather than the speaker, such as:
"Your suggestion is entirely wrong."
JM2C of course, and it is possible that I don't know what I'm talking about. I am not a psychologist or a logician.