The only time any scientist ever says "gravity is just a theory, it's not proven" is sarcastically, as a response to creationists saying evolution is "just a theory".
Also, explaining why you're wrong in a way that doesn't hit your moving goalposts isn't abuse and doesn't make someone a "biget".
well it is just a theory, an untestable unproven theory actualy
Sure, except that "just", "untestable" and "unproven" are not words any real scientist would ever unironically attach to the word "theory". If you can't even be taught to correctly use the basic vocabulary of science, why should you expect anyone to respect your opinions on scientific topics?