It is legal to insult people and companies.

It is legal to insult people and companies using their trademarks.

It is not legal to tell insulting lies about people.

It is not legal to use trademarks in a comfusing way.

It is generally legal to sue you, make you spend lots of lawyer money, and make your life miserable to defend your use of a trademark.   Fordreallysucks.com is an example of one persons story.