If I had to agree to like someone, then I wouldn't even like my spouse or kids or even myself on some days. No, I can completely disagree with someone on all manner of things and still like/love that person.
However, there seem to be an increasing number of people who become incredibly hostile if you don't share their same political views. There are people who don't seem to be able to like people unless they are on the same side politically. The tyranny of the so called Tolerant. Who simply cannot Tolerate those who disagree with them.