Injustice!

But moderators, by definition, have an advantage over ordinary forum members. And you want everyone to be equal? That's a utopia. A forum, like a model of a state, must have authority. Otherwise, it will be overwhelmed by anarchy. And authority must be respected, not argued with its representatives about the application of sanctions to those who violate order (which, by the way, are stipulated in the forum rules).
If a user doesn't like the actions of a moderator, that's their personal business; many people don't like many others. If, however, they believe that the actions were unjustified and inappropriate, they should contact the administrator, but first, they should find out which rule of the forum they will refer to in proving their case...