There was the 20% of the population that actively opposed the revolution many of whom were attacked had their property seized and were eventually forced to move to Canada. As well as the majority who really just wanted everything to carry on peacefully
Alternatively it could be that 100% of the population fully supported the revolution leading to a universal popular uprising of the oppressed - just like Russia in 1917!
A partisan wouldn't find it hard to call what happened after the war as a sort of ethnic cleansing, though more on political lines than ethnic.
On top of that, numerous civilians, particularly those in positions of authority, were subject to a sort of low key terrorism, such as being dipped in hot tar or having their homes burned down. Even being a child of such an official was solid grounds for being attacked. And in the South, people were actually murdered for having Loyalist sympathies.
This was actively encouraged by the leadership, by the way, not some decentralized mob violence. On reports that this was happening in New York, for instance, a military official put an halt to it. On hearing this, George Washington immediately intervened to allow it and upbraided the officer for hurting the revolutionary cause.
Not actually making the case that American rebels were evil terrorists: just making the case that making such a case wouldn't be too difficult for someone with an agenda, given the standards of how we label things terrorism nowadays.
If 100% of the population was on-board, then who did they rise up against? Even if it's a single leader, he/she is still part of the population of a country.
