Just text him next time, no need for the screenshots, if he questions politely tell him to check his texts and dont ruin your workday. The fact that two employees didnt show up is blessing, now you can step up your game and move closer to being the employee, he cannot afford to lose. If he argues even about work listen validate and move on to the next task. He needs to see the new you but it will take time. And it does get easier especially when you work together and long as you dont forget DB rules and DETACH