It's dumb propaganda, no one is denying for right groups exist in ukraine.
You either believe that people have a right to self determination or you side with authoritarian regimes like that of russia, north korea, and iran and believe that somehow "nato expansion" was a legitimate threat that justifies the invasion to reclaim a former soviet state.
I assure you I will sleep well at night knowing that people who are incapable of calling out the atrocities commited by putin, and russians both historically and in this war think im a racist who is saying mean things on the internet.
Which groups and subgroups get a right of self-determination and which don't?
The people in the east
had representation in a democracy. And they were the majority, so they elected Yanukovych.
It was a coup that disenfranchised them, removing their elected representatives and putting in place an autocracy that claims to rule east Ukraine without giving them any representation, first 'elections' without them voting, then no elections at all.
So the separatist regions voted democratically within the DPR, LPR & Crimea to become independent, and later again voted to join Russia.
What makes it okay for the west to institute their vision for Ukraine by undemocratic coup d'etat, and not okay for the east to hold a referendum to join russia?