Why do I sometimes hear bah when I pass by others? Is it disgusting or something?

The reason why people purr is not necessarily because they are disgusted with someone or something, but also because they are not adapted to the environment, such as the bad surrounding environment and dirty air quality. However, in addition to the above reasons, we should also find reasons from ourselves, such as personal hygiene habits, and try our best to overcome the disgust caused by our own reasons when communicating with others, but we should not worry too much. We can open our minds, get rid of bad habits and face life positively. I hope it helps you.