Also the latest "taboo" is discrimination on intelligence. You can not help it that you were born below the IQ Bell curve. "You just gotta work harder for it" is like telling an overweight person to "just stop eating so much". Difficulty learning new material puts you at an eternal disadvantage, with no way to catch up to what smart people are learning in their teens and early twenties.
The big five openly discriminate on intelligence. Intelligence and aptitude is also correlated with your upbringing (Did you have smart parents to guide your academic career and interests? Were they rich enough to help put you through a good college?).
For all the renewed interest in identity politics and combating discrimination, intelligence is really the odd one out. High school teachers berate you for something that isn't your fault, it is commonly accepted to call out your low IQ, no matter how much you want to work for a tech company -- even if they favor women, poor people, minorities, war veterans, the disabled -- you are not going to get hired to fill some neurodiversity quota.
The ease with which the left ridicules, stigmatizes, and marginalizes right politicians (Bush & Trump) and those that vote for them is astounding to me. "Those idiot low-educated racists ruined it all! They are not smart enough to vote rationally!". Change "low-intelligence" with any other protected status and such language becomes vile and primitive.