While Dot is on the extreme susceptibility list, I would treat every mango tree as equal when it comes to flowering and spraying for anthracnose (or powdery mildew). All blooms can be susceptible if the conditions are right, or wrong in this case, and it is not worth a poor fruit set to not spray.
Now, as far as the trees being resistant when it comes to "non-flowering" periods, I would look at the following: Pickering, Duncan, Keitt, Mahachanok (from what I have seen), Gary, Carrie, Cogshall. Fairchild, Florigon, Glenn, Van Dyke, Mallika (I would not be surprised if Imam Pasand and Neelam had decent resistance), NDM and VP. There are also a number that may not be in the group of resistant but do very well, produce well and less susceptible in the SFla humidity: Southern Blush, Graham, PPK, Bombay.