Although you shouldn't judge and criticise, or think less of a person who does this, this is a classless thing to do. This can actually be unhygienic because if they try on new clothes at a shop, they could spread disease like that. It is gross and smells gross and it really puts me off my food when I smell someone like that. The reason why I look down on this a bit more (not the person, just the act of not being clean) is the fact that this can be helped. All as they need to do is have a shower which will only take ten minutes, wash their hair and they will be fine. BO in itself can't really be helped as much, but even then you can still ware deodorant or perfume (if you are a woman). This isn't classless eg for people who may live in third world countries or for really poor people who may not even be fortunate enough to own a shower or pay for water. It is only classless for people who do own a shower and hot watering system and can pay for water and deodorants.