It’s funny because antisemitism has historically been the glue that held Jewish communities together. When we were collectively hated and kicked out of countries, we had to stick together in order to survive. Ever since we’ve been accepted by the wider world, assimilation and intermarriage has skyrocketed.
Nevertheless, negative thoughts about Jews come from preconceptions and stereotypes about us which can mostly be combated with efforts to continuously make a Kiddish Hashem. Only in this way will non-Jews come to see that what the negative beliefs they have about us might not be true.