First, speak ill of others behind their backs and judge their behavior at will. In fact, everyone has his own behavior, so it is naturally impossible to get everyone's approval. But in my opinion, whether this person does well or not has nothing to do with us. If what this person does has something to do with you, this person has something to do with you, so you can comment out of kindness. If this person has nothing to do with you, even if he does badly, it doesn't matter.
Second, if you don't pay attention to personal hygiene, everyone should have a sense of hygiene. When you are away from home, the first impression that others see you must be your appearance. If you don't pay attention to hygiene, your beard is messy and your clothes are spotted, then the first impression you give is definitely bad, even bad, and the first impression is often very decisive.
I wonder if one or two wonderful things will happen to everyone in their life. Anyway, I did it. There was a boy with the same major in college, and he was deeply impressed. He doesn't pay attention to hygiene. He was fine at first. He didn't find it. After a long time together, he found it really unbearable. His kettle was full of black dirt, and then he still used it and didn't wash it. He doesn't wash his clothes until they smell, especially in winter. When he wears a black coat, he sometimes smells. According to people in his dormitory, sometimes people in their dormitory are eating. Later, because more and more students discovered his health problems, they would try to stay away from him in class.
Third, I like to make noise when eating. Actually, I don't want you to be quiet when you eat, but at least don't make a tut-tut. When I was eating, someone was slurping all the time. When I think about it, I feel that I have no appetite. Eating is supposed to be a pleasure. If this happens, it's really hard to accept.
I think good behavior habits can be advocated and learned, but bad behavior habits are really unacceptable. It is better to try to correct it, or it will be embarrassing to be pointed out in person one day.