This is really rude.

I'd venture to guess that they didn't bother to tell you their tactics because they wanted to replace you as soon as their FC member showed anyway. In fact, with such a group of people, they probably wished that you make as many mistake as you can so they can kick you out easier.

I hate it when people just sack outsiders like that. Either they should just wait, or they should be committed to play with that outsider for the run.