To the contrary! They were tricked to believe that they were part of society. They aren't. By voting for Trump they reassured themselves that it won't happen to them. Often times racism against the newest group of immigrants coming from the group of immigrants before them is seen by the latter as a rite of passage to be accepted into US society.

The Irish used to be in a similar position like the people from South America today. Now they are seen as white but before WWI they weren't seen as white by the WASPs. And it's totally normal for some of the second or third generation immigrants to become racist against new immigrants. Rite of passage.