Wearing bright colours clothes is someone's personal choice. Some people love to wear bright colours and some prefer to stuck in black and white. If we talk about boys then there are some who love to wear all colours and rest wear only black, blue, white.
According to me, its totally dependable on my mood which color I gonna wear today.
In my opinion, color does matter. Wearing the right color is also as essential as choosing the right fit outfit for your self. To bold and bright colors are not for formal wear, they are usually worn during parties. Light and subtle colors are good for the summer season whereas dark colors are perfect for winters.
In my point of view, color does matter. Whether it is men or women, the colors should be chosen based on the occasion, time and their skin color.
Who told you that men cannot wear bright colors. I have seen lots of men wearing bright color on a sunny day at the beach. It is like you have to choose your colors according to the environment. Men usually choose dark color for parties and that suits them. That is why they wear darker colors, when on a sunny day on a holiday they tend to wear bright colors as they are not attending a program.