I disagree with racism, and I disagree with profiling and stereotyping. It’s a lazy way to avoid having to wrestle with new ideas, cultures, and people.
If you’re the sort of person who always has a ready reason to dismiss blacks, Jews, women, gays, Muslims etc. because they might disagree with you, then you probably have the intellectual appetite of a picky child who won’t try green foods because he’s afraid they might taste bad.
If you want to disagree what someone has to say, then you need to engage with their ideas, not just lazily says “kek Jew”.