Sorry, but if you're weighting votes, regardless of your intent or schema, you're disenfranchising people. Disenfranchisement includes reducing the value of votes for a class, and that's exactly what you're suggesting. You can attempt to obfuscate by saying you're increasing the value of some votes, but that automatically decreases the value of others.
Not only that, but it's more likely to increase sharp class division. People who only get half a vote are less likely to bother, making the problem worse, not better. Rather than do our duty, which is to educate citizens, you've decided that some aren't worth the effort, and we shouldn't let them gum up the works for the rest of us. You were right earlier, it does sound very much like something SomeDude would suggest. Give that some thought, rather than trying to convince me that it's not what it is.