Is it normal to eat butter by itself?
Unusual.Less common, but harmless
It’s less common than spreading butter on something, but plenty of people like the taste and eat a little on its own. Having some now and then is generally harmless; the amount matters more than the quirk.
Sure—some people like the creamy, salty taste enough to eat a small pat straight from the fridge. It’s not everyone’s snack of choice, but food preferences get weird in plenty of harmless ways.
Butter is rich, so eating a lot of it regularly can add up. A little nibble now and then is no big deal; if you’re going through large amounts or feel unable to stop, that’s a different question worth paying attention to.