I'm not excusing what she did, but keep in mind that often people just don't know. If you go to almost any pet shop, they'll have a dozen bps housed together and often people are told its OK to house them together. Unfortunately there's a lot of misinformation out there about keeping pets in general. So in that case I don't really fault the person. All we can do is point out the correct way to do it and hope they pay attention and listen.
Now that being said, if someone is told proper husbandry and care and still ignores it, then they deserve condemnation IMO.