No such thing as stupid questions

I just can’t wrap my head around this and I’ve heard it ever since I was a child. How could something with multifaceted benefits be a “weed”. It’s not like it’s some trashy plant similar to Hogweed.

Edit 1: I changed this to answered due to the majority of commenters agreeing that the term “weed” is subjective and may or may not apply to a Dandelion.

Lots of informative, thought provoking comments here, I did not expect this question to branch off into as many directions as it did. Thanks everyone!