"I'm so sick of being told that because one party has a majority at one election they have 'a mandate' "
Then move to a non democratic country that adheres to your beliefs, or take one over and be as despotic as you want (all for good reasons, of course - right?).
Personally, I'm sick of people not understanding that democracy doesn't mean "we always do what I want". It's the collective will of the governed. You can campaign, lobby, harangue, whinge, whatever you want to do to convince people your point of view is right, but sometimes you'll be in the minority and you just have to fucking accept it. It won't always be right, it won't always even be GOOD, but ultimately majority-rule is the only morally-defensible form of government for the long term.
There IS a thing called the tyranny of the minority, you know, and if you have a single shred of non-partisan logic, you'll understand why that's more dangerous than the tyranny of the majority.