I don't normally post anonymously ever, but I thought I'd just say what I've probably previously stated in a non-anonymous post, where I say that I downthumb people that complain when their post is downthumbed.
Downthumbing is a reality, whether you feel it's deserved or not. Complaining about it, only makes you look bad, in my opinion, or writing a post expressly asking why your post was downthumbed also merits one from me. Or then subsequently saying "Oh so I get another downthumb." Ugh. That's worse than the person doing the actual downthumbing of a nicely thought out opinion.
Not everyone is going to agree with what you're saying. That's just a fact of life. Get over it, and quit moaning and groaning when you feel you've written a nice post, but someone happens to disagree with your way of thinking.