Whether you are starting a new business, or just trying something new in your workplace, having critics is not necessarily a bad thing.
Upsetting the status quo is likely to ruffle a few feathers.
If your new business plan disrupts an industry or makes a lot of people angry, there is a good chance you are on to something good.
You should worry more when nobody is talking.
People in power often benefit from maintaining the status quo. If you find a way to save the company money, but your plan would take some responsibility away from another employee, their natural reaction would be to fight against it.
The key is to identify why people are being critical, and to not let their shaming discourage you from trying new things.