Some people argue for sport. You’re allowed to stay on the bench.

A disagreement is not automatically an invitation you have to accept. Certain people enjoy the contest itself, independent of the topic, and with them the conversation cannot be won because winning was never the point of it. You can usually spot it within two exchanges, by how fast the subject shifts when you make a good point.

When you spot one, say something plain and get out: fair enough, we see it differently. Do not explain your reasoning again, because explaining is the game. Save the real conversations for people who are actually trying to figure something out with you.