I know what you mean. When people associate “evangelical” with Jimmy Swaggart, Westboro Baptist, Osteen, and even crackpots like Chas. Schuler, it upsets me. I don’t think they make the incorrect association on purpose; they just don’t understand the true meaning.
Evangelicals believe in the verbal plenary inspiration of the Scriptures. Following any belief system that is extra-Biblical is in no way evangelical. It seems that it takes so little for a religious group to go off the rails. Gotta stand firm!
You are absolutely right!