That's because you never had a good cup of real coffee. I roast my own beans and then grind what I need right before making a cup. It's a world apart from the stuff you get at Starburnt's, diners and restaurants. Good coffee is never bitter.
If you ever get to go to a real coffee roasting establishment, try a lightly roasted cup of coffee that was roasted within the past couple of days. It will be like the difference between Melba Toast and a loaf of bread fresh out of the oven.
Beer? I like it once in a while. I don't drink it much so I buy the more unusual micro brews and have one or two during band rehearsals and share it with the guitar player (we play at his house so I bring a six of different beer every time I go there as a token of appreciation for the use of his home, electricity, etc). If I'm looking to do serious drinking I stick with Maker's Mark and coke. Me and whiskey, we've come to an agreement over the years.