if you ever see a post from somebody that hates a group of people and post examples of the group actually being bad THEN DO NOT TAKE IT TO HEART. think of how many people of that group exist, and then think of how many examples of evil people there are, and then think of the likely overlap there are.
wether the poster knew it or not, they were performing/participating to multiple fallacies; cherry picking (only picking clean cherries when harvesting and think every cherry is clean), selection bias (doing a research on how many blonde people there are and only having one participant), anchor bias [specifically about what information thay have heard from other people who hate that group](hearing "i sucked a weiner, for twenty bucks" and only hearing the first part, making it sound just gay), and is participation in conformation bias.
also if you notice one of these fallacies then just ignore the message, only respond if its in real life, <and if so please point it out to the person.