Can coffee be acidic?

That's true, too much coffee is not good for your digestive system. 

But why do people drink coffee? It is mostly to stay alert, focused, and energized. So once you stop coffee, substitute it with an energy drink that boosts your energy levels without caffeine. My suggestion would be to try Endurance by https://zolnutrition.com/ 

The flavor is just awesome and keeps you going all day long!

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Coffee is Acidic,should i avoid coffee now?

Most coffees are acidic. You can neutralize some of the acid by adding milk.

Coffee is very acidic. That is why when you have an ulcer you should never drink coffee.

Bitter but not acidic 

Yes - for comparison, water is ph7 . . . coffee is ph5 . . . . orange juice is ph3.5  (higher is less acidic).

There are lowered acidity coffees available . . . the only national brand I know of is "Kava" and they make an instant as well as regular.  It is a Borden product - don't know if all stores carry it but I use it when my ulcer wakes-up.

Yes coffee is acidic.

It may help to eat before you drink it and/or add milk to it. 

Coffee IS acidic.  So are "soft" drinks.