Absolutely! Afghanistan should be proud of their performance and i am sure they know it. They won hearts of many fans all around the world with their fight against good teams.
That's why I said several times in this thread that this is Afghanistan's best World Cup they have ever played. They were amazing in this World Cup. Winning against teams like England, Pakistan and Sri Lanka is a sign that they are becoming more mature these days. I guess one of their players said they should have win the match against Bangladesh too. They could have been in the equation playing the semi finals today. But they should not be upset of how they ended this World Cup journey. They should be proud of theirself.