Appeal to motive
Dismissing a claim because of what the speaker stands to gain from it.
How to spot it
Is the reply about why they say it, and not about whether it is true?
Example
“Of course the baker says bread is healthy. He sells it.”
How to answer it
Motive is a reason to check the evidence. It doesn't make the claim false.
Related
- Ad hominem: Attacking the person making the argument instead of the argument.
- Bulverism: Assuming someone is wrong, then explaining why they hold the mistaken view.