DF has been ranting on FB for weeks, telling the world he won't tolerate any discussion on the GE and that social media isn't for politics, etc etc (despite him being the only one I've seen saying much at all and he does it at least once a week!). Similarly, I keep reading on MN that you should keep your voting preferences to yourself and not discuss with friends and family or 'ram it down people's throats' which seems to cover any remotely passionate mention of politics. Obviously, I don't advocate sweeping generalisations about supporters of particular parties or the sort of 'all Tories are scum' talk, which clearly isn't productive but surely since this affects every single one of us, our DCs, jobs, economy, environment, what happens to us in old age, blah blah, it's something we shouldn't be afraid to discuss so we can better form opinions?
When I was at secondary school we had mock elections and unknowingly saw a bit of a premonition about the sometimes shallow approach many people have to voting for how their own country is run - i.e. we all voted for the hottest guy, whoever made the best badges and did the funniest speech etc. - and as an adult it's as if nothing's really changed 
Isn't discussion really the only way we can deepen our understanding of what it all means and why is being passionate about something so fundamental such a bad thing?