Guly Do Prado`s brace and a goal apiece from Adam Lallana and substitute Lee Barnard saw the Saints cruise to victory.
Tisdale said: "There's no shame in our performance and I'm not unhappy with the way we played.
"The second goal was always going to be the key and at 2-0 we could have gone safe and settled for that but that's not the way we play.
"We encourage our players to play extremely open and beating Sheffield Wednesday 5-1 a couple of weeks ago was just as much us as this game.
"We will always continue to attack and we have to be us, and there's nothing really to criticise the players for."