I think the staff is horribly rude. Whether a marketing incentive or not, it was still a complimentary offering. Their choice was to either say "Thanks, but no I'll pass" or to say "Thank, I'd love some coffee."
There was no bait and switch that I can tell. It doesn't sound like the rep said I'm bringing bagels, fruit, coffee, juice and breakfast tacos tomorrow and then only showed up with bagels and coffee. And even if the rep had promised a more substantial breakfast, it was still impolite to complain about it to the rep.