Ugh, as an americano drinker I'd be annoyed as hell by this. I have a 52oz water cup at my desk, for me much of things is about the quantity of liquid so I dilute everything. I get my alcohol drinks heavily cut with mixers so they last longer. If drinks are small I finish them way too fast. So a tumbler of a mixed drink lasts me 8 minutes but the same drink in a pint with little ice and more mixer is more like 40 minutes. One leads to shitfaced quick and is a nice buzz. Same for coffee. Sitting at my desk with a small drink I'll finish it without noticing I'm drinking it. 20 oz coffee with the same # of shots and It'll take 30 minutes to finish and I'll actually notice and enjoy it.
I'm an adult, I can pay attention to what I order, and I'm not embarrassed to order things that are not directly on the menu. I'm tipping the bartender and the barrista so they make it the way I want it anyway.