"When someone requests a quote at my job, if they reply with a thumbs up emoji, I absolutely will not assume that they want to purchase it, merely that they're acknowledging receipt of said quote."
Which is fair, and why there is even more context here; specifically the historical relationship with previous contracts, and the casual agreements made in the past.
For example,
If I ask a restaurant how much to reserve a table for 20 in a private room would cost, and they send me a number, thumbs up is "quote received"
But if I book a table at this restaurant once a month for various group sizes in private rooms, and am on a first name basis with the host, sommelier, and chef going years, and for the last six months the "negotiations" had shortened to text message exchanges like...
me: private room for 10 people, friday the 3rd at 7pm to close?
them: 8pm earliest availability, i can reserve you a table in the lounge until the room opens up, 2000$ booking/minimum spend, 20% gratuity will be added to total
me: book it
And then on our most recent exchange:
me: room for 25 people, wednesday, 3rd 6pm to close?
them: time is fine, it'll be be the room at the back with the fireplace, 3000$ booking/minimum spend, 20% gratuity
me:
Anybody reasonable would think i had booked the room, and was on the hook for the booking fee with that history in place. And that's what the courts are saying in this case - there was an ongoing relationship, and a history of casual acceptance, and the deals were practically 'routine'.
It would be unreasonable to argue that the thumbs up just mean, "hey thanks for the quote, ill consider it and maybe get back to you" with this history.