If by "insane" you simply mean defying social conventions, then no, that's not insanity. Often times adolescents do this out of normal teenage rebellion, and adults do it sometimes because they are stressed out, or simply don't believe in social conventions.
People who are "insane" are not in control of themselves, and think bizarre thoughts, act inappropriately often without their conscious knowledge, become paranoid, or deluded, etc. People with mood disorders become too depressed to function normally, or so elated that they do very extreme things out of character like steal, gamble their entire life savings away, or other out of character reckless behavior. This may or may not include excessive merriment or laughter. Some people who are manic or hypomanic simply become irritable and lose their ability to make sensible decisions for themselves.
If it's within your control, the behavior could be unhealthy if you consciously and consistently do it to cause pain to others, or to self-destruct.
