I received the gray nickname primarily because of Brabus's statement.
However, it turned out that you already had two previous instances of leaving games in the last two months: one with Brabus and another with a different player, where you left without warning (apparently, you "had to leave urgently," but for some reason, you didn't warn your opponent).
And this is a repeat offense; you already had a gray mark previously (where you claimed that you "don't care about these rules"), which doesn't reflect well on you.
So, the situation is clear, and there's no point in blaming Brabus. The admins are aware that Brabus is suspicious, but your behavior doesn't improve because of that.
And the insults from your side only worsen the situation. Even if what you said seems like obvious logical conclusions to you, expressing such "conclusions" publicly or in a private message is offensive.