That's very true. But when we're talking about science, we need to be exact. The definition of a theory is not something that people perceive differently, or believe different things about. Theories have to be clearly defined so that scientists around the world can study the evidence for them and replicate experiments. Often the theories need to be altered as new evidence comes to light.

Disagreeing with what a theory states is another matter. But what you have to remember is that in the case of ToE, many scientists from many different fields have been studying it for decades, and there is a large evidential base for it. If someone claims they disagree with it, it is only logical that they will need to give some concrete reasons why. Writing "it's a lie" in big colourful letters everywhere might be emotionally satisfying but it isn't exactly going to blow science out of the water.