There are 2 very different kinds of arguments. Arguments where you're trying to convince the other person. And arguments where you're trying to convince bystanders. These require completely different tactics. If you're trying to convince the other person, be humble. Be gentle. Be subtle. Ask them questions. Let them think they came up with the idea entirely on their own. If any bystanders are watching this discussion…
Feynman has a famous anecdote about sitting around the table with senior scientists in contentious argument where he was perplexed because it was obvious to him who was right. They argued all sides, and ultimately agreed, having proofed the idea and its alternatives.
That's who I want on my team: people who can shake things out without needing to be right or needing others to be humble, and without playing games. After viability, that's my primary criterion for a position.