I'm assuming you're very young. But think about it from his perspective, he probably finds it very cringeworthy and embarrassing, because honestly it is weird. Choosing to be a furry isn't some religion, cult, or lifestyle. I'm assuming you're going through a phase because you're lonely and want to belong somewhere/to a group of people, but you're probably going to grow out of it. I don't think many people are going to take your vent here seriously because it's not like you're being hated for your race or sexuality, you're choosing to partake in an odd hobby, and especially if your brother is as young as you probably are, it's expected that he's gonna find it eye-rolling, weird, and gross.