That said, it's disingenuous to insist all criticism of Soros is from anti-Semites. While many people on the right do believe lots of absurd conspiracy theories about Soros, I believe only a small percentage of those people are anti-Semites or intend any anti-Semitic undertones in their criticism. Mention of Soros is definitely an anti-Semitic dog whistle for alt-right/far-right people, but it's not for a lot of other people who are right-adjacent. The majority of conservatives who complain about Soros probably aren't anti-Semites; I bet you'd find massive overlap with support for Israel, for example.
It is certainly possible that some of the conspiracy theories originate from anti-Semitic sources, but as they trickle down to the general public, you'll see that most conservatives basically just consider Soros the left-wing version of the Koch brothers - a billionaire who's funding everything they dislike. Which isn't wrong, to an extent.
[1] https://www.nytimes.com/2018/11/14/technology/facebook-data-...
As an example of the disconnect there, consider the influx of individuals trying to claim refugee status in Israel and Israel's reactions [1], against what Israeli media openly declares "infiltrators". Israel's actions here have drawn the ire of groups directly supported by Soros' organizations. The point is that just because a Jewish man happens to be one of the most well known names associated with globalism hardly means that globalism is now suddenly a secret word for Jew. It doesn't even make any sense.
[1] - https://en.wikipedia.org/wiki/Illegal_immigration_from_Afric...
Typical republican conservatives tend to be the opposite of antisemitic. They are very pro Israel, for instance. They are the people who might applaud Trump for moving the US embassy to Jerusalem.
There's a twinge of antisemitism that creeps in on the fringes of the left too, also stemming from Israel (and its conflict with the Palestinians).
I don't agree with it, but i see the hypocrisy in being able to talk about whites (who make up the majority of the top 10%), but not the jews (who make up a majority of the top 1%).
I'm in the camp that recognizes success, but seeks to be associated with it and emulate it rather than "dog-whistle" as you say (I work at a jewish company)