Some do. A few are able to understand what I ask for. Occasionally there are those that can actually execute it too. So it's generally easier to have sugar.
I find most people make others tea how they themselves like it, and assume a good cup of tea for them is good for everyone.
Last place I worked I did the tea round more than the rest of the department combined - both because I wanted mine done properly, and because I actually asked each person how they wanted it - and asked for feedback on whether I did it right - so they preferred me doing it.
Current place we all make our own - which is just as well since the crappy urn we have runs out of hot water after about three cups.