EDIT: I'm no doubt the angry alcoholic archetype who doesn't want to discuss it when my Windows-using friends try and tell me it's better than my Linux setup. Then again, I know my stance is the absolute right one ;)
There are some political stances that also imply a particular moral/ethical stance. I think it'd be pretty normal to not like someone if their morals are incompatible with yours.
It is easy to get along with people of various ideological positions, as long as you are willing to nod along, regardless of real world consequences of their ideological stances. As long as their opinion is the one ever said out loud.
What I have noticed in recent years is that people increasingly have little respect for those they disagree with and it’s largely on the basis of that disagreement.