Evolution: "just a theory". Scientific caution is sometimes confusing.
The fact that our best available theories are still speculations misleads some people to believe that these ideas are not founded. Hence, some people suppose their uneducated opinion is just as bad, or as good, as the mainstream scientific hypothesis.
This trend is probably led by the way science has been taught, i e as a flawless method that offers facts about reality.
And by pre-scientific philosophy, still strong in our modern societies.
Evolution is "just a theory" the way Notre Dame is "just a pile of rocks", isn't it?