> This insinuation really is only made to Jewish people
This is untrue. It's untrue to such an extraordinary degree that it's hard to believe you're arguing in good faith.
Accusing people of being loyal to some other nation or cause is levied regularly against almost all peoples to some degree or other, particularly if the person holds any ancestral pride or accoutrements. Even just refusing to adapt to food customs is enough to arouse suspicions.
Look at the outrage about the "invasion" because some protestors hoisted Mexican flags. Various members of Trump's administration declared this a demonstration of "occupied" territories.
If you're Chinese in America you must never, ever, show an iota of association with your homeland -- or even just your grandparents home if you're 3rd generation -- or you will be ostracized and considered a deep agent. An Indian that has an Indian flag in their bio or the like is going to be frequently asked why they don't move back if they "love it so much".
Similarly, a frequent criticism of some Muslims is din wa dawla, which is a belief that religion and politics/the state are one. Indeed, if someone has religious beliefs that can go in conflict with the needs/goals of the state, there is a discord there that needs to be considered.
There are Americans who are more loyal to Israel than the US. Like, they will literally tell you this without an ounce of compunction or question (which is utterly verboten among virtually any other group. Similarly a US congressman wore his IDF uniform into congress, which is simply insane). On the flip side, there are many Jewish Americans who are deeply critical of Israel. Like does anyone think Bernie is a deep agent of Israel? Bernie, like much of Jewish America, is deeply critical of Israel.