Looking around my house, I have probably 8 or 9 different cleaners with a lemon scent. None of them smell particularly pleasant. I have only 1 orange scented cleaner. My guess is that the acidic nature of the smell of lemon would mask the harsh cleaner smell more easily than an orange smell.
If I smell a badly done lemon scent, I might associate it with cleaners, since this is where I have previously smelled a bad version of lemon. If I smell an orange scent that leaves much to be desired, I would not get the "cleaner" association simply because orange scented cleaning products are not as common. That doesn't mean I would be more pleased with the orange scent than the lemon.
As to some notes being safer than others, I would say that they are. Lavender is safer than many notes. Ever smelled a lavender that turned your stomach? Worst case scenario that I have found is it might be a bit sharp and unpleasant. As long as you don't hate the smell of lavender to begin with, it is a relatively safe bet. For a less safe note, I don't have to think very hard to conjure up a nauseating vanilla or sneeze inducing pepper.
I can see what you were going for here, and unlike other members I do not see it as a personal attack to try to classify basenoters as a group. Yes, patterns do exist. I think you just discovered that some basenoters are quite afraid of them. It is sad to see people jumping down your throat without attempting to really understand what you are getting at. Some people like to think that they exist outside the pattern, which they do not. Sociology will account for us all in the end, my friends.
I also do not agree with your conclusion, however, as I think I am just as skeptical about orange notes as lemon. If you wish to prove something to this group of individualists (irony intended) then I suggest concrete examples and numbers.