I don't drink coffee, but we do have a coffee maker in the office. Next to the hotplate there is a decal on it that says "HOT". Go figure.
And customers complain about everything. I know people who have gone through a drive through, gotten their coffee, found it not to be hot enough for their taste, and getting out of the car to go inside to complain about it. Hot coffee can cool down (duh, right?), but you can't warm up a cold cup of it in your car (duh, again, right?). Thus, when you order hot coffee they give you hot coffee. If you don't want it to burn your nether regions, don't dump it there.
I hit my thumb with a hammer the other day. It hurt. Why did the hammer company make the hammer so hard? If it was soft it would not have hurt me. I think I have a case. Maybe I'll retire early and buy lottery tickets and complain about rich people.