I just disagree; it's not personal.
Fine, final piece of evidence that a flat tax rate would be idiotic:
Currently the top 10% of all income tax payers in the UK pay about 59% of all income tax. They also pay tax at higher rates than anyone else. That is why they pay so more, but that's also because they earn more than most, of course.
Under a flat tax system they would enjoy substantial - maybe massive - tax cuts.
Those on low incomes would almost certainly pay more because around the world flat tax systems are associated with high National Insurance contributions - that hit the lowest paid hardest.
So flat taxes are really about cutting taxes for the best off, cutting services (like the NHS) massively and requiring payment for their use instead, and increasing tax, overall, for the least well off. That's the reality.
http://www.bbc.co.uk/news/uk-politics-22575135
I personally prefer getting those who've been lucky and have more than they need to make life a bit easier for those who haven't.