I think I imagine the conversation would go like this:
Me (to FA): A Bloody Mary, please.
Seatmate: You shouldn't drink that.
Me: (Accepting drink from FA)
Seatmate: It's immoral.
Me: (glug, glug, glug). Ahhh.
Me: FA, may I have another, please?
Seatmate: How dare you! I told you I want no part of this. It's immoral and I cannot accept this.
Me: (Accepting second delicious cocktail) FA, I believe my neighbor would like to move to another seat.
Me: (glug, glug)
Seatmate: Option A: Either gets relocated by FA or Option B: Does not get relocated. Begins loud, obnoxious lecture on all the reasons I will go to a dark and desolate location upon my death.
Me: (Chugging down third cocktail): Plugs in noise cancelling earphones.
Seatmate: Continues loud, angry rant about immorality of consuming alcohol.
Me: Continues to relax.
Seatmate: Escalates angry tirade.
FA: Orders seatmate to calm down
Me: Attempts to read book, while stealing glances at scene unfolding in aisle.
Seatmate: Continues emotional meltdown.
Me: Staring with incredulity at absurd scene unfolding in front of me.
FA: Calls for additional FA's. Places plastic handcuffs on seatmate. Relocates seatmate to quiet seat in isolated part of cabin.
Me: Returns to book. Requests another cocktail.
Aircraft eventually lands.
Me: Deplanes. Continues on to destination.
Seatmate: Is taken to dark and desolate location in airport to await questioning.
Me: Have interesting story for new friends during hotel's Happy Hour.