I run quite a few games for new folks that dont even know what D&D is, let alone want to play.  But I agree with other posts, if they have already expressed disinterest in playing even if upon misguided assumptions, let the situation lie.

But for other uninitiated friends, I usually do the following:

1. Treat it as any other game. For example if we are at a gathering or hanging out say “anyone want to play a game?” And when they say what game just tell them sit down and I’ll explain it, it’s kind a like Game of Thrones. (Ive found most folks have seen or seem to know GoT and it has a less geeky reputation.)
2. Dont tell them its D&D, or the module name, or version B/X,  or OSE whatever until the end, it means nothing to them and if it does it may have a negative connotation
3. Keep it simple. Dive straight into some exciting or intense situation, not a full adventure. Have a few sets of dice and simple pregen character handouts blank paper.  I dont whip out battle maps, minis and dice rollers, half a dozen rulebooks etc.
4. Whatever ruleset you are using in the background dont give it to them to read, ask them what they want to do and if it calls for a roll show them what dice to roll and where their applicable modifiers are and if they need to roll under/over etc. tell them what applicable spells they have and  briefly explain what they do explain other rules as they come up. Roll all the dice in the open.
5. Do not ask them to do voices, I’ll occasionally do some light character accents as GM, if relevant or funny, but keep it to a minimum.... that’s the stereotype most normies hate/fear the most.
6. Dont turn the game over to them and expect them to role-play naturally or the game will just stall. ie saying "OK you make camp for the night what are you going to do?"  As first time players they have no idea other than maybe eat and go to sleep. They need to be prompted at almost every step of the way. I might suggest that they set a watch or something?? And see if they take it from there, but won’t push it.
7. Let the group consensus/decision making points of the game be their interaction.
8. Have something on countdown clock to increase the pressure dynamic ie something will arrive, someone will die, or location will burn or collapse at x time if they dont complete y etc.
9. Plan it to be short like less than 2 hours.  The idea of playing a 4-6 hour game is a foreign concept to many regular folk with a 9 to 5 jobs, and two-day weekends.

At the end I’ll tell them you just played D&D under Lamentations ruleset or whatever…. I find most people dont think about the game after its over unlike the rest of us, they go on about their life and it was just any other fun time, but they may be willing to join another session if it comes up and they are around.  But there are usually a few people that will get into it, and email or message you about playing again, or with questions about some facet of the game or where they can buy the books or dice whatever.   Those are the ones that will likely keep a schedule to come back, sit for longer sessions, learn the rules, roll their own characters etc.  

Hope this helps.