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This is a UI issue and there's probably a learning curve involved; new users need to learn that they can't upvote their own posts, so the text box telling them this has value. Old users will mostly have learned this so won't see the Big Red Box.

Not telling new users explicitly that they can't upvote their own posts may leave them confused as to how the site works.

Eg,

"My reply is very important, I want to make sure that it goes to the top of the list of replies. Therefore I need to upvote it as many times as necessary so everyone reads it first. Why can't I do this?" - Yousef the user