The technique that this sentence best illustrates is understatement. Understatement means that you are not showing the full 'strength' of something, but it is rather understated - so here, the coach only said that 'he was glad' even though his team won the Super Bowl, which is a huge deal. So his emotions should have been way stronger.
Yes many minority are discriminated against the only thing thats different is that we don't burn them and force them to work for no pay and slaughter them like animals.