Be charitable. If you haven't been exposed to actual linguistics (and know about things like PIE), you have the current, normal, common-sense view on language, which is that what you speak is normal, and what speakers of any other dialect or language do it wrong. I've heard intelligent, university educated people say things like "I don't want to learn $Language with an accent". The fact that no such 'accent-less' language exists is simply not a fact that they know. Such misconceptions about, and people who suffer under them are misguided, not stupid.

My two cents.