What are some disadvantages of riding a bike in the community?

You don't get much of an upper body workout during road riding. Using the wrong technique and/or a poorly fitted bike can trash your knees. The hunched-forward position can cause pains in neck, shoulder, hands and the lower back. Depending on riding style and choice of surface there is a greater or smaller risk of falls. If you're riding in traffic you might become the target for road rage or sheer clumsiness. You can get a flat tire. It makes you sweat; especially bad if biking to social event, work, school, etc.

Most bikes don't have a roof in case of rain.

You can't bring your family with you, unless they have bikes of their own.

Helmet and/or wind will oftentimes mess up a good hairdo. You can crash and get hurt/dead.