Twin studies, when controlled properly, also show that homosexuality is only weakly correlated to genetics, at the very best. It's not a comfortable discussion leftists what to have.
There's lots of anti-science leftist ideas out there.
And what you're referring to in the OP is "socioeconomic mobility."
This site and chart actually tell a dishonest story.
https://www.economist.com/graphic-detail/2018/02/14/americans-overestimate-social-mobility-in-their-country
They only show 2 quintiles - highest and lowest. Strong sign of an anti-US bias (usually it's self-loathing Americans who do these things). But what about a measure of SEM that shows the aggregate of all quintiles? Or how about the SEM of people moving just one quintile higher? That'd be a more telling statistic than the dishonest portrayal from that site.
Another telling figure is the fact that "millennials" really do have it hard:
SEM has stalled since the 1990s:
https://www.theguardian.com/society/2018/jun/15/social-mobility-in-richest-countries-has-stalled-since-1990s
Other than semi-trolling and pretending to have any sort of semblance to intellectual posturing, do you have something substantive to talk about? You can't just post boring or unimportant topics and then beat your chest that you've trumped all the smart people on a dying message board. Buffoonery, brah.