I didn't bother reading this entire thread, but imho even if what b4nny did was not only rude to that player, but was also very hypocritical, I think it's pretty childish for something like this to be posted by Se7en. You'd expect that the best team in Europe would sort of set an example for everyone else by not stooping down to that level of directly calling out a specific player.
Also, let's be real and not act like we're all saints that have never gotten mad at someone who's performing poorly in a pug. Even I've done it and I'm already shit at TF2.