I am often rather annoyed by the fact that many webpages out there on the Internet use broken and disgusting HTML that will not render properly in my browser (Firefox). Usually it is the case that the pages are trying to do stupidly complex and useless things to look cool or they are being constructed by complete amateurs. Some sites claim to be compliant but are in fact not, but more often people don't even bother to go that far. Sometimes, however, it is the webpages of people or groups that I would expect to know what they're doing. Standards are the solution to this problem. In a quick run through, for example, only one of the blogs on my blogroll is actually standards compliant; though some come close, most are grossly erroneous.
Folks, it's not that hard to see what you're doing wrong, just swing by The W3C Markup Validation Service and see what isn't right with your website. Even if you don't want to go through all the effort of making your page fully standards compliant, you might try using the validator to see what some of the errors on your site are.
To be honest, I usually don't much care about standards compliance from other sites but I do care a whole lot when a site does not render correctly because it's malformed.
So, in short, bitch bitch bitch, peoples' sites don't work right, bitch bitch bitch.