Without knowing exactly what was said between the set of fans and the club. It seems a ridiculous 'punishment' from the club. If the set of fans have apologised and said they won't do it/offend/whatever again then club statement if needed (if someone has complained) saying said fans have been told off, won't happen again, banner banned blah blah lets get on with the fibta.
Again without knowing the full convos - for me personally the boycott seems daft.
Still tho - a season long ban on all flags and banners seems nonsense!