Never lack respect, it's a team sport, with this behavior you show disrespect to the teammate coming in. Never let that happen. You can be disappointed but keep it to yourself or play tennis.
Did you ever ask yourself why so many children of professionals become also professionals. You can say it's their name or contacts, but the truth is that they have the best teacher in their parent. If you know what it takes and how to train from young age, you are halfway there.
An example of what you don't want to see during a game! Often this great game gets put in a bad light by players, coaches, etc., who don't understand that they represent the game itself. You should respect the beautiful game every time you play and be thankful or stop playing! ⚽