There is no quote I know of where Trump says “all Mexicans are rapists”, but do by all means provide it. I doubt it exists. What I suspect is that you refer to the quote where Trump says Mexico is sending their rapists to the US. I don’t have the quote in front of me, but saying some illegal Mexicans are rapists is certainly NOT the same as saying that ALL are, which is what you allege. And the fact that some are rapists, as well as murderers and thieves, is beyond deniable. Admitting that does not indict all illegal Mexicans.
It’s as I wrote; it is commonplace to take specific words and inflate them to make them worse than what was actually said.