when i type out emails and correspond with people for work then yes; i agree; punctuation and grammer are very important in conveying that you are intelligent. when i'm on IM, text messages with friends, or an anonymous cannibus forum i could care less. everyone is entitled to their opinion. and since it's his post...he's entitled to type it however he wants.
i don't know where i fall in the whole scale of "younger" or "older" generations. i'm 35 years old. one thing i have learned though is that every generation bitches about their parents and the rules they have to deal with. and then when they get older they bitch about the "kids these days." you say you expect more out of the younger generation. kids today can build you a computer from the ground up with a handful of tools that would fit in their pocket. they can design a website in the time it takes you to turn your computer on. this issue has nothing to do with generations. it's a person's point of view. you just happen to have a different one.