Whataboutisms are neither an effective nor intelligent debate tactics.

Sorry, but when the Left actively engages in and promotes identity politics among "victim" groups for over 50 years to the point of calling anyone who doesn't follow their every wish and actively support them racist, homophobic bigots (even their own, like J.K. Rowling), what do you expect the natural reaction from the other side to be?

The natural reaction is going to be exactly what you have seen from the Right recently. The recent rise of White Nationalists groups predates the rise of Trump; it actually coincides with the rise of more extreme tactics by identity politics groups.

Identity politics based on victim status is 100% an invention of the Left; there is no debating this.

So to say that the problem with the Right is victimhood and identity politics is to basically admit the current problems in US politics are caused by the Left.