Thank people and get rid of it later somehow seems to be the best way. If you hate it there is no reason to cover it up with candy and drink it.

Important to note that when you say bitter, that could be coffee, but it might be more specific. Strip mall parking lot businesses like Dunkin Donuts serve a very specific form of coffee. The taste is more a product of roasting coffee to the point that the outside burns black and the oils in the beans start leaking out to the surface, oxidizing and being lost. This bitterness is the burned nature of it, like charred wood, and the oils that make each coffee have a specific taste are lost from this process. This is on purpose. Burning it all for quality control.

People somewhat into coffee call this "dark roast" or "gross."

People really into coffee respect it and that it has an important place in history and coffee technology, as a storable land transportable version of coffee from another time before air freight. Cowboy coffee. Diner coffee. Coffee that can take the paint off your 1974 Chevelle.

It's horrible stuff really. But it's important to love it for what it is... and then pour it out when nobody is looking.