Well not to make light of Pirl's concern, but I don't know if anything really needs to BE changed. There will always be those that are rude-will just be rude anyway. I don't know that there has been a lot of members complaining about this as an ongoing problem. ?
I think Pirl was more venting her aggravation than anything. I do think she has a good idea with asking for a member to be removed from the site if they are going around pestering people for plants repeatedly and being rude about it. A warning perhaps? Then banning them. I can see where once in a while a person may come here only to be a trouble maker (troll?) and outright banning those few bad apples who continually harass members would be the only fix for that.