Immigrants tend to be hard-working. They have to be, to overcome the inherent disadvantages of starting over in a new country. Whether or not you believe in “systematic discrimination,” on a basic level, you don’t know anyone, don’t know the culture, and may not know the language.
Some succeed right away. Others don’t and have to hope that their children can have a better life.
That said, if you’re finding reasons to resent unsuccessful immigrants for being “welfare queens,” and finding reasons to resent successful immigrants for doing better than (some) native citizens, maybe it’s time to admit your real problem is with immigrants period.