Bloomberg is certainly throwing some shade at Trump, and I'm sure it's chaffing his ass. Bloomberg knows how to get under Trump's skin. Which is a good thing. Even if he loses, he's willing to throw massive amounts of his money to bury Trump, which is also a good thing.
Ultimately, Bloomberg is banking on a brokered convention. He has spread his money out enough that he has a ton of super-delegate votes in his pocket. If no one gets a majority of the bound delegates during the primary, it's going to be a brokered convention. Anything can happen. Clinton only won 1 out of his first 10 primaries so Biden still has a shot at it but if it comes down to a brokered convention, Bloomberg has 60 billion dollars and that can be very convincing to a political party. Total dollars spent during the 2016 election by the winning candidate 646 million. That's about 1% of what Michael Bloomberg has.
Bloomberg's terribly flawed, but we don't have the privilege of stomping our feet on the Internet about one damn issue over and over and over and over and over, and then potentially watch another (possibly weaker) candidate either 1) lose to Trump this fall, or 2) further empower the GOP in the House and/or Senate, and then shrug our shoulders and say "...Oh well, better luck...next time. Four more years of Trump would be far worse than even Bloomberg's worst shit he did in the past. The GOP is very much wounded right now. They've dug themselves into a hole that has left everyone but the true believers shaking their heads in disbelief. This is about getting rid of Trump and inflicting massive damage on the GOP. I'd like to tell both Bloomberg and Trump to fuck off, but we just don't have that luxury.