Awwwww.
While I'm not Otokoshi, I think that I can answer this. It's about knowing your roots. Or rather, knowing the roots of gaming. We who have been around longer, don't take it too kindly when some - excuse me - n00b comes and proclaims something like:
Who the hell is Sierra Entertainment?
...Not a huge corporate deity like Sony, I'm sure.
Displaying in one, swift blow that he doesn't know anything about gaming. Sorry for slight exaggeration there, but it's reasonably close. You could have stapled big "I'm ignorant Sony fanboy"-sign to your forehead, it would have accomplished pretty much the same thing.
And as for what knowing who Sierra is has to do with this topic; like someone said, the only case where petition has been ever known to work, happened with Sierra.
Don't take it too seriously, I think that nobody cares what you think of Sierra, or if you know what it is at all. It's just that we don't know what we should do with your opinion, when you obviously are not familiar with the context.
Anyway, Sierra's days of glory were well before 2000, and their forte was adventure games. We know that you are too young to have experienced most of Sierra's games when they came out, but that's not an excuse for not knowing who Sierra is.
And as a final thought; I think that for a large part people are just teasing you. Don't take it too seriously.