Or to be attacked. I've never voted Tory but the way I've witnessed people who say they do be treated like they're committing a crime isn't very nice. It isn't just disagreement either, it's real anger. I would imagine it's the same the other way around where people who were brought up with a certain set of political values with absolutely no exposure to anyone outside people who agree with them, have very little tolerance of the views of other people or even of their right to hold different views.
'Never kissed a Tory' t-shirts being a frivolous yet symptomatic example. I think it's generational too. Unless part of the student movement young people tend not to be terribly tribal. Left leaning generally but not tribal in a way that those who were around in the 70s and 80s seem to be and seem to have a bizarre mistrust of anyone not equally as tribal as they are.
Most of my friends (25-40ish age group) vote for a rainbow of different parties and none seem to view the other as the 'enemy' for voting a different way. I prefer this and find it much more conducive to constructive conversation than people who's loyalty to a party is matched only by loyalty to their football club where everything quickly descends into a shouting match based on "How dare you disagree with me"