There are a lot of people, especially on lemmy, who see everything through the lens of their personal ideology and utterly lack the ability to empathize or understand different views or life situations. You only matter to them insofar as to how it can advance or support their ideology. It’s pathological, and their views should be ignored.
That’s a fair question. It’s mostly just my observation, but if I were obligated to guess, it is partially filtering based on the types of people who are active and readily express their opinions on various topics, but also because of the reasons people moved to lemmy in the first place, many of whom were evicted from reddit because they were too extreme.