I know this is bait but…
I grew up in dirt poor in rural Australia as a young fag, was outed in high school and faced constant bullying, have been gaybashed on 3 separate occasions, including one severe enough I ended up in hospital not knowing how I got there. Was even fired from my first job when word got around there - where my boss refused to give me severance and outright told me that it'd cost me more to fight it in court than I would get at the end (may not have been true, but an 18 year old kid believes that stuff). There's sob story than that, but you get the picture.
I think you'd be surprised at how often it's the people who have actually faced discrimination or oppression with direct material consequences on the basis of some demographic they belong to who tend to be the ones who have a problem with "idpol". And how often it's people who have never really been in a position where prejudiced attitudes from others have had a material effect on their lives who tend to be the ones that want to focus on it.
Which is, of course, the whole point of wanting to focus on class and dismantling the capitalist system. Because that makes the world a better place for everyone (or at least every prole) rather than selfishly focusing purely on elevating whatever tribe society has decided I belong to.
More than that, if you want more than just to preen yourself over how moral and accepting you are of minorities (how magnanimous of you), the primacy of class is essential. Right now, with the kind of politics common in the West, you're relying on the goodwill and generousity of the majority to their "other" to get anything done. You're relying on pity.
I saw this first hand when I was coming up in LGBT activism 10-15 years ago. Most activists were people whose coming out story was like their mum tearfully telling them she'd love them no matter what before their dad bought them a car. These were the comfortable people how had the time and spare resources for this kind of work and they were very into hating on straights and antagonising people because something called them a poofter once.
It works OK when times are good because the boogeyman majority can afford to be generous, they're willing to take a little abuse from you because they're comfortable and it can make them feel good about themselves to see largesse being bestowed on the unfortunate.
But pity is a well that dries up when times aren't good. If all your politics is good for is establishing tribal identity based on increasingly atomised demographics as the accepted way politics is to be conducted, you're in for a very rude awakening when things take a turn downward. As we've all been finding out over the last few years.
So you know what, dealing with sexism, racism, homophobia, transphobia is an important and worthwhile project. But putting these things first, droning on about "privilege" to people who have nothing in their lives telling them they have any, purely on the basis that THEIR skin colour or sexuality is in the majority is idiotic. This just emphasises your own prejudice and cultivates theirs while convincing them that your interests and theirs really are at odds.
This is why class solidarity is the necessary first step and the one that even people on the left seem to have forgotten about and are neglecting to the point that we almost have to start from scratch now. Because it shows people what they have in common, that their interests are mostly the same. If you can convince Cletus, Jamal and Tran that their material interests are closer to each others' than to William J. Investmentbanker, then you can have a much easier time convincing Cletus that racist discrimination against Jamal also hurts HIM, or that sexism to Sally does, or that no help being available for Sam the poofter does and so on.
The problem that I, and AFAIK many on this board have with "idpol" is that class solidarity - the necessary foundation to build on - is neglected in favour of demography and virtue signalling which impedes real world progress any time there is economic pressure (like now).