Why does this not lead you to believe that he dislikes immigrants who are criminal, dangerous, or eat house pets? Why do you think it represents his attitudes towards all immigrants?
In reality, when Trump talks about immigrants he talks about illegal and problematic individuals. On top of that, he also talks about not immigrants a lot.
Just like you don't need to say "I hate women" to be a misogynist, you don't need to say "I hate immigrants" to send that message. You just don't.
Also I don't care about Melania. "I have a black friend" type arguments are shallow and worthless.