Do you think that good manners are infectious?

你认为良好的习惯是有感染力的吗?Generally speaking,it is of no doubt that good manners are infectious。However,there are times when we meet some people who are not affected by other people's manners at all。In these occasions,I consider that the infection of these manners are limited。够了不。。。也不早点说要回答。。。