As has been said, the hate mainly stems from the IE6 era, it has gotten much better since then (though it still lags a bit behind in terms of standard support - at least it went beyond the bearable mark by now). That said, I'm not that happy about Chrome, I'm afraid it may become the new IE, I lost the count of how many times I saw "HTML5" sites that are Chrome-only in practice (luckily it's mostly demos, but still). That they're pulling off the browser-specific APIs thing and trying to push that like it was the standard doesn't make me happy either (especially a few that are equivalent to HTML5 ones, but are just there to make up for the browsers not bothering to implement them properly - audio tag, anyone?). Also more specific to webkit, but I lost the count of times that something that should work on Opera doesn't, just because the author decided to use the webkit-prefixed properties in the CSS file exclusively (what).
Then again I already stumbled upon behavior that's webkit specific (not sure if it's only in Chrome or webkit in general) and that doesn't rely on non-standard APIs or stuff like that. I once had to figure out why my game wasn't working on Chrome, despite working on IE, Firefox and Opera. Turns out that Chrome parsed script tags in a completely different way the other browsers did, which resulted in trying to use undefined objects. I could only get the code working again by using... document.write, something that's supposed to be avoided like the plague. Thanks, Chrome! (and I thought I already had enough issues with Firefox not liking my code) I'm not sure if the HTML5 standard determines a specific way to parse the script elements or not, but it goes to show how easy it's to make something that works only in whatever Chrome uses without even realizing it.
Also maybe only tangential, but there's something to be said about respecting users. I normally avoid using web apps, but for some thing I'm doing in a group I have to use Google Docs because they have some text file with the proposed tasks in there. Every time I go there I get a message about how my browser is out of date and that I should "upgrade to a modern browser, such as Google Chrome". I'm using the latest version of Opera, which is actually made by one of the main vendors working on the HTML5 standard. Thanks for essentially insulting me, Google! (yes, I know it's just checking if it's IE, Firefox, Chrome or Safari, but c'mon!)
Don't pay much attention to "the hedgehog" in my nick, it's just because "Sik" was already taken =/ By the way, Sik is pronounced like seek, not like sick.