Biased

Multitude of bias people trying to downplay my argument, despite it being true. What would this be?

The statement provided seems to contain potential issues including the "Bias Bias" and the fallacy of "Ad Hominem."

1. **Bias Bias**: Claiming that a multitude of people are biased against your argument can sometimes be an example of "Bias Bias," where you assume anyone who disagrees with you is doing so out of bias rather than considering that they might have legitimate reasons or evidence for their disagreement. Labeling all opposing viewpoints as biased can prevent you from engaging with the actual content of their arguments.

2. **Ad Hominem**: By suggesting that those who are disagreeing with you are biased, you may be engaging in an ad hominem fallacy. An ad hominem occurs when someone attacks the person (or people) making the argument rather than addressing the argument itself. It diverts attention from the topic and shifts the focus to the character or motives of those who disagree.

This statement also implies a **Appeal to Personal Incredulity**: This involves dismissing other viewpoints merely because you find them difficult to understand or unconvincing, rather than engaging with the evidence or reasoning presented.

To strengthen your argument, it's crucial to address the content of the counterarguments presented rather than attributing them all to bias. Engaging with the specific points of disagreement with evidence and logical reasoning will be more productive.

By "downplay" I assume you mean to claim it is de minimis. If so, your other discussion participant presented a proposition and bears the burden of proof it is of no consequence.  First, have him admit your statement is true. Then ask for evidence it is de minimis.