Disclaimer: I do not own Batman, the characters, or anything related to Batman except for a few t-shirts.
Doubt
or
Four Reasons Alfred Hates Batman and One Reason He Doesn't.
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One.
Alfred resented Ducard, or rather, Ra's Al Ghul, for some very good reasons. He was glad that Bruce had had someone to look after him and be there when Bruce really needed it, but Alfred wished it could have been him. He could have swayed Bruce from his path towards stubborn vengeance and put him on one of compassion, like that of Thomas Wayne. Alfred wouldn't have betrayed Bruce when he didn't obey mindlessly. Alfred wouldn't have forced Bruce to leave his mentor, his father figure, to his death.
Alfred hated Batman because of how he was formed. He hated him because he couldn't change any of that.
Two.
When Batman came into being Alfred knew that Bruce would get hurt, but he had not let himself grasp the concept of how badly. Alfred didn't think Bruce realized what seeing him like that did to Alfred. Seeing Bruce bloody and in pain and refusing to be helped. In the time that Bruce had become Batman, Alfred felt like he had aged a hundred times faster, and sometimes he even looked it, too.
And Alfred knew that for as many times that Bruce had gotten injured so far, there was likely to be five times more that amount to happen in the future. Bruce would just keep on getting injured again and again and eventually one of those injuries would be the death of him, and Alfred wouldn't be able to do a thing to prevent it – any of it.
Alfred hated Batman because he was the reason Bruce didn't care how injured he got, even if Alfred did.
Three.
He never grave Bruce Rachael's letter to him, and he would never reveal to Bruce what it had said for as long as he lived. Alfred hated Batman for forcing Rachael away; forcing way anything that could amount to some semblance of normalcy. Batman forced Bruce to act like a pompous ass in front of people who he normally (that is, before Batman), could have been friends with – could have had a relationship with.
Batman was destroying what was left of Bruce and leaving only a mask. Since the Thomas and Martha Wayne had died and young Bruce was left in his care, Alfred had always wanted happiness for Bruce. Even just a little.
Alfred hated Batman for giving Bruce no chance of that.
Four.
Alfred wasn't surprised when the Joker broke out of Arkham. He never was. Because a mad man like the Joker couldn't be caged, couldn't be stopped unless he wanted to be. And he never wanted to be caged for long. The Joker was going to keep on terrorizing Gotham city and its citizens, with Batman along for the ride every single time.
Alfred hated Batman because he was the part of Bruce that was obsessed with stopping the Joker, too preoccupied to think of anything else.
Alfred hated Batman because he wasn't anything like Bruce, but at the same time, he was.
One.
Every night when Bruce went out as Batman, Alfred would sit down and watch the news. It was a simple thing, really; a habitual routine that plenty of people performed nightly. But despite the media's harsh views of him, whenever Batman's antics made the news coverage, Alfred would sit very still and watch very closely. Closer than any other person would.
Alfred didn't hate Batman because he knew in his heart that Bruce was doing the right thing.