I live on the border and I have never believed Mexico was a "friend" to the US, in spite of hearing many politicians characterize them as "Our friendly neighbor to the south" for many years.
I was angry at Mexico's reaction to 9/11 and have been amazed that more people don't see it the way you do. I don't lay all the blame on Fox for the reaction- the citizens of Mexico did not stand up and support the US, so it seems he was representing how his citizens felt.
I was working at a Port of Entry on 9/11 and I don't remember a single Mexican traveling into this country expressing any type of sympathy or support for the US, that day or the days and weeks afterward. They were angry about it being harder and taking longer to cross the border. Several even stated that they felt that 9/11 happened because the US "tries to run the world" and things of that type.
No, Mexico is not our friend, and many of their citizens do not respect us, many of their people choose to come here to use this country to gain a better life, most do not want to be part of our country, and only want to be citizens for the benefits.
What do we expect when we've been letting millions of freeloaders from Puerto Rico do the same thing for 100 years?