If you have used the red contacts before, you would find that the look of you would be really different from the look that you do not put on the contacts. There are a lot of people who are fond of putting this kind of contact lenses on their eyes and they enjoy doing this a lot because they find that this is cool.
Of course, this kind of color lenses would be popular because there are a lot of Hollywood stays putting them on. In this kind of movie world, there would be a lot of horror films. In order to make these films, you can find that people would need to put on those lenses. Again, this is for the sake of the look of an evil. Therefore, you would find that some of the fans of those movie stars would try to put on the red contacts in order to make them more like their stars or idols. It sounds silly but some of the teenagers are trying to do this kind of thing anyway.
No doubt, some people would try to treat this kind of lenses as the real fashion. Since red color is the warm color, it would not be really odd for you to put on this color of lens, compared with the green one. But compared with some colors like brown or blue, red would be rare because you cannot probably find natural red eye but you would find natural brown eye. Therefore, wearing the red contacts would show that you are wearing the colored contact lenses and the color is something warm indeed. This explains why some people would like to treat this as a kind of fashion indeed.
If you really want to try using the red contacts, you can try to do this after research.