Virtually everybody in the scene at that time was getting stoned! ;-D Dylan didn't need to talk anyone into it, that's for sure.

Consider the words of the song:

Well, they'll stone you when you're trying to be so good
They'll stone you just like they said they would
They'll stone you when you're tryna go home
Then they'll stone you when you're there all alone

(It's not about getting you stoned, it's about stoning you...and there's no escape from it. Doesn't matter what you do or where you go.)

But I would not feel so all aloneEverybody must get stoned

(Well...I'd be okay with it if everyone else had to face this same shit too...then I wouldn't feel so all alone)

Well, they'll stone you when you're walkin' along the streets
They'll stone you when you're tryna keep your seat
They'll stone you when you're walkin' on the floor
They'll stone you when you're walkin' to the door
But I would not feel so all aloneEverybody must get stoned

(same stuff as before...no escape from being stoned)

They'll stone you when you're at the breakfast table
They'll stone you when you are young and able
They'll stone you when you're tryna make a buck
They'll stone you and then they'll say, "Good luck"
Tell ya what, I would not feel so all aloneEverybody must get stoned

(how about the rest of you folks take some of these stones too?)

Well, they'll stone you and say that it's the end

(but it isn't)

Then they'll stone you and then they'll come back again

(see?)

They'll stone you when you're riding in your car

(no escape)

They'll stone you when you're playing your guitar

(naturally)

Yes but I would not feel so all aloneEverybody must get stoned, alright

Well, they'll stone you when you walk all alone
They'll stone you when you are walkin' home
They'll stone you and then say they all are brave
They'll stone you when you're set down in your grave
But I would not feel so all aloneEverybody must get stoned


The last regular line in bold above makes it quite clear what the song is really about. You can't get a person stoned (high) any longer once he's been set down in his grave...but you sure as hell can still "throw stones" (meaning criticism) at him. Note how many rhetorical stones are being thrown at Maggie Thatcher, now that she's in her grave. Criticism is a thing that goes on long after a person dies.

The party-like atmosphere of the song stands in hilarious contrast to the complaint that is really being expressed in the words...typical wry Dylan humour to do it that way, I think.