West Brom's official Twitter account tweeted "you're welcome" to Manchester City, while its fans at Old Trafford sang: "We've won you the league, Manchester City, we've won you the league".
But sealing the silverware thanks to a slip from old enemies United and their boss Jose Mourinho - a long-time rival of Guardiola - was a sweet moment, especially after they lost to their neighbours in the Manchester derby last weekend.
City claimed the crown with five games remaining, equalling the fastest-ever title success and are on schedule to break the points and goals record for a single season. Instead, some players had even left the country after being given a couple of days off by Guardiola. Probably because I won eight championships, I was not in the moon with the victory against them.
City scored 93 goals and lost just twice all season. Previous times, we almost threw it away and that was a feature of every season we won it.
Five wins from five would give them 103 points - eclipsing Chelsea's record of 95 back in the 2004/05 season.
By Christmas, City were already putting together 18 consecutive victories - only one short of Bayern Munich's major league record, also set under Guardiola.
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"I had a feeling when I woke up this morning but it's a different experience when you're waiting for a team to lose".
Former Manchester United defender Nemanja Vidic on Sky Sports: They deserve the title, they played really good football for the whole year.
Silva has been a key figure for City for much of the season, putting in some inspirational performances that have seen him nominated for the PFA Players' Player of the Year award.
It was a far cry from his trophy-less first season with City and Kompany said Guardiola's tenacious attitude led them to the summit.
It sets the right tone, ensures the campaign ends in the right mood, and could also now see them hit a lot of records as well as the right notes.
"Yeah, its special, I'm privileged to be part of such a great group, great players, good guys, good mentality, good atmosphere in the team, every single time I'm on the pitch I enjoy it". Guardiola had planned a day of golf with his son Marius on Sunday, so the Spaniard might have learned of his first Premier League while on the course.