Several thoughts, Lisa:
First, yes, people do downvote posts simply because they disagree with them. And since, recently, I've seen that some of my WikiTree heroes have lots of down votes, I've decided to stop worrying about them.
Second, quite a few people respond to posts like yours by saying that most down votes are given by mistake. I disagree. I haven't given a huge number (15), but I meant every one of them. Anyone who votes someone down by mistake can reverse their vote by clicking on the lighted-up arrow a second time (although maybe not everyone knows that). But by the way, apparently unlike some other G2G contributors, I've given most of my down votes for extreme rudeness. If I simply disagree with someone, I will make a post and say so rather than vote them down.
Last, as for getting Club 100 badges, or Club 1000, in no time they will just disappear into your history. Your total contributions, the number I think most people look at rather than the particular badges, won't be affected by which badge you get.