>>20284035common misconception. if you try to learn from typical shounen stuff, yea, that's pretty dumb. if you've every cringed at watching an english dub, you'll understand why
but slice of life anime is typically fine since they talk how regular people would talk and use common vocab. not always, but that's just how media is. like if you'd watch a regular english sitcom and sometimes think, "this is not a conversation normal people would be having"