Jose Altuve thought he found a tell in Philadelphia Phillies pitcher Noah Syndergaard's delivery and went to inform his teammates about it before their at-bats in Game 5 of the World Series. But whatever Altuve said to his teammates didn't work. Yordan Alvarez and Alex Bregman both struck out after their discussions with Jose Altuve.
Altuve was certain he saw something that would help out his teammates. The incident was similar to Bryce Harper's in Game 3, when he picked up on Lance McCullers Jr. appearing to tip his pitches and went on to inform his teammates.

It's not clear what exactly Altuve tried to tell Bregman. Either way, it was enough to mess with Bregman's head, resulting in a strikeout.
MLB fans on Twitter think Jose Altuve made an absolute fool of himself.
"Sit down little guy," said a fan.
"Such a tool," replied another.
Jose Altuve is an easy target for baseball fans

Altuve is one of the most hated players in the MLB. Since the Astros' cheating scandal in 2017, baseball fans have let him have it. He consistently gets booed every time he comes to the plate in an away game.
Funnily enough, players like Tony Kemp and Colin Moran don't receive the same treatment every time they step up to the plate despite being on the same roster.
Altuve seems to be one of the scapegoats for the cheating scandal because he was so successful in those years.
Maybe it would have been different had he received some sort of punishment at the time. As such, MLB Commissioner Rob Manfred is partially to blame for the way he handled the entire scandal.