It is hard to argue that being kind would be a bad thing. You could meet a person whom speaks to you warmly and shines helpfulness from the eyes. You might not even realize what you witnessed in the moment, but you would think to yourself afterwards that not everyone in this world is a jackass afterall. If the person you met was a clerk at the shop counter, you probably would be happy to be a customer there again. It leaves its mark, even if you are not paying attention when it happens. The question is, are you digesting it when you receive it? To do that, you would have to be aware of it.