By using that 43% number, the implication is that nearly half the people in the United State are freeloading off the backs of those who pay taxes. And, it implies that for those who pay taxes, they are bearing an undo burden just by being upstanding tax payers.
Let's look at WHY so many don't pay taxes. First, nearly all pay some taxes. Renters pay property taxes in their rent. Workers pay payroll taxes. And people pay gas tax. 
Now many don't pay taxes because they don't make much money. I used to visit old folks in their homes. Many worked all their lives at like a checker or waitress or laying concrete. No retirement. Health care costs. Yes, they paid not income taxes as their monthly was $1200. 
Now when Trump was accused of not paying taxes, he said he was "very smart". That's our leader. Which is worse: the rich not paying taxes so they buy another vacation home of the poor not paying taxes so they can buy food (and yes, sometimes drugs).
The 43% figure needs context.