Well, you can also call it 'parentpiller', because they are only criticizing how 'stupid' and much of 'garbages' their parents to have inheritted shortness, poorness, fatness etc. to them without ascending!
They are like lying on a bed complaining 'Why did my parents bear me with such bad genes? I hate them forever!', 'i wish my parents were wiser...', 'Look at other parents! They know how to nurture their kids! They have them reading books, learning courses, etc.! But how about my parents!' without ascending like gymmaxxing.
I think this is a subtype of incel. Call them parentcels or parentpillers. This kind of men only complains about their parents without anything else meaningful... no women will fall in love with them...
imagine you are a girl and see a guy complaining 'Fuuuuuck my parents are foolish! They reproduced me with such bad genes!' lying on a bed without doing anything else(lying down and rotting).
Will you fall in love with him? No! You will def think of him as having some mental problems and a bad personality(complainer-personality type. A typical 祥林嫂 Xiang Lin aunt, who is a character in one of Lu Xun's works and complains this and that like 'Why is the weather so cold! I have to put on heavy clothes and trousr!', 'Why do I not have anti-nearsightedness genes!', 'Why am I so short!')