Maresca must understand the culture of competition in the Premier League because if they make a small mistake then they will be punished by a much weaker team. Now Chelsea is in fourth place in the standings and two consecutive defeats against Fulham and Ipswich must be an important lesson for Chelsea, so that in the next match they do not make the same mistake again.
The Chelsea coach is new in the Premier League, so he made the mistake of looking down on Ipswich simply because that the bottom of the table. Old coaches with experience in the Premier League know that every game is important even though it is obvious that you are going to win it. Chelsea will regret that game, because they were considered title contenders, but a two-game losing streak really puts their position in a lot of doubt, maybe they will qualify for the champions league, but not win the league.