@sexysolaire
That isn't actually true. "There is an urban legend, called an "oft-reprinted assertion" by Douglas Harper, that the modern slang meaning developed from the standard meaning of faggot as "bundle of sticks for burning" with regard to burning at the stake. This is unsubstantiated; the emergence of the slang term in 20th-century American English is unrelated to historical death penalties for homosexuality."
More likely to be derived from when it was used as an insult targeted towards older women. Some also claim it could come from the practice of fagging in British private schools.
In the end the exact origin is unknown, but it definitely didn't come from homosexuals being burnt alive.