This entire article on FOSS advocacy and Apple is a worthwhile read. In it, Bruce Byfield included some thoughts on hating Microsoft:
Microsoft is the company that everybody loves to hate. These days, you don’t even need to be a geek to express your hate. Tell an anti-Microsoft joke in the average business or college crowd, and you are guaranteed a laugh. Tell a joke against Apple, though, and surprised silence will struggle with strained smiles in your audience.
While Microsoft certainly deserves the critical eye it often receives, when it comes to “hate”, this is my take:
If you desire a better society, use a free system. If you simply hate Microsoft, use Mac OS.