30 years later only my parents remained in the house and the neighborhood racial profile changed significantly. My mother said "I don't think I could sell to someone from the new ethic group". When I asked, "Why?!", she said, "because they'll put 10 people in the house". When I reminded her we once did the same she snapped, "That was different!". The way she snapped was a clear indication she still felt pain from what had happened many years ago.
To add further to my opening quote, I have taken severe beatings, as in decades of physical pain followed, based on my ethnicity but I hold no grudge in part because I am financially secure and physically strong now. So I no longer "hurt" in a sense or naively feel like I can be hurt. But my poorer family still talks about my beatings with a grudge against the entire racial group of my attackers.
Some other research that is relevant, sorry I don't have a source to link, but it is shown that a stressed rat will not suffer stress related health disorders if you give it a smaller rat it can periodically beat up. More optimistically it will also avoid negative health consequences if you give it something enjoyable to do (e.g., a stick to gnaw). But hobbies are unfortunately a luxury for many people whereas hate-speech costs nothing.
Finally for most of human history it was prudent to distrust anyone outside your tribe. With the standard brain OS, negative emotions rush in and humans explain their poorly understood emotions with knee-jerk stereotypical views. Also have some perspective: for example if your home was your number one asset would you happy to have my childhood family move next door ? Doubtful. Sometimes anger is an understandable reaction but how to keep it from escalating to violence or being exploited politically is a larger concern.