anybody who uses the word 'heck' when they want to show emphasis, or would otherwise swear. same for 'dang', 'darn', 'frick', 'crap', and any other english word that tries to get a swearing idea across without actually being a swear word.
if you want to avoid offending somebody, swear in another language. if you just want to show emphasis, just swear! if you don't you look like a darn sissy when you dang well say these fricken words.