Jackass

jackass
noun
jackass noun [C] (SILLY PERSON)
old-fashioned informal
a person who behaves in a silly way
Source: Cambridge Dictionary

A well-meaning jackass may not mean any harm but they can cause plenty as they often do not know what they are talking about.

Take everything a well-meaning (or not so well-meaning) jackass tells you with several grains of salt.

Joke: What do you call an angry carrot?

A steamed veggie (and it’s best to move away from people who are often angry)