Donald Trump -- Burned by 'Mexicans' Rant ... Univision Pulls Out of Miss USA

Donald Trump's smack in the middle of a full scale Mexican backlash -- his Miss Universe Organization just lost a major TV deal over his rant about Mexican immigrants being rapists and drug dealers.

Univision announced Thursday morning that it will not air the hugely popular Miss USA (owned by Miss Universe) competition ... which is coming up next month. Colombian singer J Balvin also pulled out in protest -- and as did co-hosts Roselyn Sanchez and Cristián de la Fuente.

Trump made the now infamous rant -- saying Mexico's not "sending their best" -- when he announced he was running for the Republican nomination for president.

Trump responded ... "Univision wants to back out of signed contract because I exposed the terrible trade deals that the U.S. makes with Mexico." He added that he loves Mexico, but not the bad deals.

Univision planned to air the first ever Spanish language simulcast of the pageant, but ... no dados.