I am always surprised to hear the word "weed" used. Honestly one person's unwanted plant is another fellows prized begonia! The stickery kind are truly one of the few widely hated (goat heads, you may call them) and even those help keep trespassers off your land!
My great grandmother made salad from the leaves of dandelions and some people plant morning glory on purpose! Don't let anyone tell you which plants are appropriate and which are not. Today, appreciate whatever weed you like best!