What logical fallacy is displayed by saying, "Sure you think we should build a bridge; you own land on the other side"?

The statement illustrates the Ad Hominem fallacy, which occurs when someone attacks the person making an argument rather than addressing the argument itself. By suggesting that the individual advocating for the bridge has a potential personal interest in the decision—because they own land on the other side—it diverts attention from the merits of building the bridge and focuses instead on the speaker's motives or character. This undermines a rational discussion about the bridge's benefits or drawbacks by implying that the person's argument is invalid solely based on their personal situation.

In the context of logical reasoning, focusing on the motivations or background of the speaker instead of engaging with the argument itself does not contribute to constructive debate and can lead to a misinterpretation of the issue at hand.