Funny, two of my kids' ped dentists told me specifically that sucking on a pacifier is bad. The thing is, it alters their bite, including giving them an overbite. It doesn't matter whether it's the baby or adult teeth.
Sometimes it's all in the way a question (or answer) is phrased when it comes down to common wisdom. I myself would err on the side of caution whether it's the bite OR the teeth.
As far as flowers go, I think that there are people who love to hate on someone and if others think it's deserved, they'll jump on the bandwagon with flowers, though they don't actually write in themselves. Or, they'll send a flower for something is bizarre because they are very insecure and just kind of "wonder" if that person might just be right, instead of actually researching it to see if they really are. (I saw one of those yesterday.)
Then there are people who really try to offer good advice and others see that and offer flowers. Those are the ones that someone should feel good about getting a flower for. Not something snarky.
There are some fun threads full of wit, though if you didn't "keep up" with what has been said in the past with that person, you might not "get it". (Kind of like an inside joke, but not meant to be.) If I know what's going on, I might give a flower for something a bit 'colorful'.
But I know exactly what you are talking about with people jumping on a bandwagon to be mean to someone. There have been many discussions about that.
Dawn