You think that just because I disagree with you I haven't looked into it? While what you are describing does sometimes happen, the idea that it's the primary mode of operation, or even a significant one outside the fringe of the left, does not match what I see.
People can, and do, discuss these issues without being called bigots or racists, people can, and do, attack minority candidates for their policies.
That said, if you disagree that people, regardless of race, religion (or lack thereof), sex, orientation, etc... deserve the same basic rights, damn straight the left will call that out.
This attempt to push this idea that the left is wrong for pointing out discrimination is an attempt to push fear into the hearts of the privileged. I am one of those classic straight while males that should apparently be so fearful - but I'm not, because I don't see this attack. We want to allow people the same rights we already have! How is that an attack? How is that 'special rights'?
There are no 'special rights' being granted - just the same rights you and I have. That isn't a cost to us, it lifts us all up.
Yes, there are the minority few who will claim any attack on a black person is because they are black - and that is wrong and gets called out in the rare case it happens. It is not a common or powerful viewpoint.
Yes, the right does try to disadvantage groups. Look at the voter suppression by closing polling stations in areas with high minority populations, look at the fight against marriage equality, against the right to choose. All of these are aimed at pushing certain groups (minorities, LGTBQ, women) down. Pointing this out and trying to help those people get or maintain the rights we already have (I can get out and vote, I can marry who I want) is not 'identity politics'.
Either you are buying into this fear - which you shouldn't, because this is a positive thing, or you just don't want your ability to discriminate to get taken away.
I'm not saying there are not people wrong on the left, or people who don't understand the issues and propose poor solutions - speaking out against those people doesn't make you a bigot. Discussing these things to understand them doesn't make you a bigot. We don't want people to be bigots, we are not pushing for that, but we can't tolerate the denial of people's basic rights. That's unacceptable, and we will not be 'shamed' by this crazy fear.