But laws of grammar are descriptive right?

Yes, there can be differences between disapproving who someone is, what they do, and what they think. But the three are very much linked, both in reality and in the individuals own mind (meaning they may perceive disapproval of one as disapproval of all), so one should be cautious in disapproving of thoughts/behavior/people, and aim for humility and acceptance.

And yes, I would have to agree, Christianity ought to be about humility and acceptance. On my way to work this morning I was thinking about this topic, and Jesus’ acceptance of the woman caught in adultery. As Christians we should seek to copy this example.

Some thoughts. There is a difference between disapproving what someone thinks, and disapproving what someone does. There is probably a spectrum of positions on an issue that someone might hold, some being more worthy of disapproval than others. I don’t think it is wrong to disapprove of something someone thinks (as well as disagreeing with it). I do see that as different from disapproving of the person. I agree with you that different people may have reached the same belief from very different starting points. As one example, someone with a view we disagree with might have come to that view by moving from holding a belief that we disagree with even more.

I do think responding arrogantly to someone you disagree with is unlikely to help anyone, and is probably not much good for constructive discussion

In my experience, arrogance is something we all struggle with. (Christian or not, conservative, liberal or not). I think, though, that arrogance and looking down on others is antithetical to the core message of Christianity.