While everybody expected Tavares to notch his 1000th, even the Islanders, the fans weren't ready to take the emotional load as they were caught booing their former captain:
Despite the fact that Tavares gave the first nine seasons of his career to the Islanders, they're still clearly mad at him for leaving. Funny enough, he left for Toronto with the purpose of playing more meaning full games and having steeper playoffs runs. The Islanders have made it further in than the Leafs ever since Tavares joined.