This just seems like a very natural back and forth
You complain on social media about your employer and how they mistreated you
They fire you for making them look bad by describing how they treated you
Your view of them as a bad employer is reinforced and you warn people not to work for them
Their view of you as a bad employee is reinforced and they earn people not to hire you.
In both cases people's views are reinforced by reality. Where's the bug?