Let's draw the line between typographical errors and misspellings.
The first is accidental and could happen with any word, name or not.
The second comes from a few different areas, from laziness and ignorance to disrespect and even racism. For laziness and ignorance, as fans we should know better and put in the effort. Disrespect and racism are obviously insulting and intolerable.
So on that basis I don't see how misspelling a player's name is justifiable.