If that’s all you said, I agreed with that part. Why did you keep arguing with me?

I see people doing this so often (on the internet especially) and it honestly baffles me. The best I’ve ever been able to rationalize it is that people are often far more interested in arguing their own points and saying what they believe than actually listening to and understanding others or having a real debate. That may be overly simplistic but it’s how I cope.