Board Game Arena

Has this happened to anyone before?

The same profile page that says this:

A significant proportion of players (more than 10%) report that they don't like playing with you.
The main reason is the following: Quitting games in progress
You should try to get more positive feedback.

Shows that I didn't quit a single game over the last 185 games...

How does this make sense?

The "main reason" does not mean the most recent reason. It could also be that the players who red-thumbed you selected that reason even though you didn't actually quit (maybe you were slow, or played carelessly, or they just selected whatever).

That sounds really unfair and random for such a big penalty...

In termos of time I usually spend about half the time my oponents do, that is not something based on opinion, it's a fact which can easily be proven looking at past history of games...

Also I've never been rude, also easily proved looking at the historic of chat on the history of games I've played...it's all recorded.

Seems unfair

The main point is that "a significant proportion of players (more than 10%)" gave you a red thumb. For some reason which I can't (and don't want to) judge.

red thumbs are arbitrary ridiculousness that should be removed entirely from the site except for personal preference. You can be red thumbed for leaving a game, despite not leaving, red thumbed for aggressive/rude chat despite never typing anything in the chat box.

I suspect you got red thumbed for having beaten someone who has a thin skin. Don't let it worry you.

It's hard to say this without sound pretentious but I think that is the case, people I beat, sometimes badly, give me thumbs down even we never even change a word in the chat, or worst ,when I'm the only one speaking and saying good luck or gg.

My karma went to 60% and I just don't find this red thumbs fair

Well, it is fair to say that the red thumb system isn't about fairness. It's about having a practical system to find out problematic players. Having 10% red thumbs is a lot and it can't be easily explained away. Like it or not, the people running this site are more concerned in having a practical system rather than a completely fair system. And I find that fair enough (pun intended).