I'm not commentating on the specific one that the OP was talking about, but in general mods will change words if the person is trying to get around the swear filter by various means, so we will change it so that the alternative word appears.
The site is run to be family friendly, and if you want to swear lots there are plenty of other places where you can vent your frustration but it is part of this sites character, and people like the friendly banter they can have on here.
I must admit I find the daffodil one particularly funny (and we do notice that some people don't even invoke the swear filter but use the word directly).