Colonial Americans were taller, heavier, better fed and better marksmen than the British they faced. The British soldiers were thought to be no more than slightly intelligent, two-footed animals by their officers and were treated as such. Ever larger land holdings by the British gentry forced many citizens into hopeless situations in the cities. In fact, early recruiting sites had a picture of a side of beef to let the illiterate know that at least they’ll be fed. Desertion, although punishable by death, was high. And you wonder why people left Britian?
What a pity your ideas on racial differences are not verifiable.
Anyway, that is just a screed against redcoats, not run of the mill Brits. Nobody liked redcoats.
How do you explain all the many many colonists who sided with the British (or legal authorities) against the patriots (or rebels, depending what side you were on)?