Is AUTHOR wrong in the post ? POST : So recently I've been watching a lot of r/ videos, and has brought some memories back of some bad experiences (for better or worse). A bit of backstory, I have one younger sibling, who loves to go out often with his close friends and girlfriend for a drink. He usually stays out late and comes back home latest around 2-3am. Because of this, my brother and I don't talk to often, but on the occasion we do it's usually asking if I can help drive him or get him something. Occasionally my brother will ask for booze (since he's 17), I agree, thinking this will give us a chance to talk for a bit. The conversations usually end short as I give him some booze and he shortly leaves with his friends. But one day came along where I decided to refuse help him out and as he usually says "Be a bro". 
This story happened about 4 months ago, around the Holidays. I was approached by my brother with his girlfriend while I was playing some Pokemon in my room.

* LB: Little Brother, ME: me

* LB: Hey can you drive my girlfriend and I to a vape store and get us some e-juice?

* ME: Wait what?

He proceed to explain to me that you need to be 19 or older in order to buy stuff for vaping (I had no idea)

* LB: Can you drive us to a vape store, its close by, not even a 10 minute drive.

I think for a moment and how I've been so lenient on him with booze that I decide I shouldn't do this to him as I personally don't support vaping.

* ME: I know I've been easy with you to help you get alcohol but vaping is where I'm going to have to cross the line
* LB: Come on man, its not that bad
* ME: Yes I know vaping isn't necessarily harmful to you but I don't support it, therefore I won't help you go and buy you this stuff for your vape.
* LB: *Scofs* Well OP, there's worse things to get addicted to, vaping isn't bad at all
* ME: Yes but...
* LB: But what? Huh?
* ME: It doesn't present you well, it just looks shitty to me when you go "take a hit" you're so much better than that.
* LB: WOW OK, THAT'S WHY? Honestly OP do some research, vaping great for your health and is definitely less addictive than weed, the booze you've been buying for me and or your dumb gaming. Seriously, you're so stupid man.

He walks out of my room proceeding to slam the door. At that moment, I was pretty pissed off that he came into my room and asks me if I can help him out and after refusing goes on to tell me that I'm in the wrong for telling him, no. I'm still personally against vaping, I find it very unattractive. But what do you guys think should I loosen off about vaping being bad or do you agree with my point of view?