Probably for the same reason why we get upset when Nick green makes an error. Even though we know he sucks , we expect him to suck, and we know it's not his fault that he sucks, we get upset because he hurts our teams chance of winning. When he makes an error, we react negatively. Similarly, when Drew is not in the lineup, it negatively impacts the teams chance of winning. When I log on and see that Brian Anderson is playing, the first words that come out of my mouth are
"s*** no Drew." If that's Drew hating, well then I am guilty.