If the Jewish people are in the habit of referring to themselves as "the holy people" then I can see that a Jewish person may feel that it refers to them. But it's not how other people generally refer to the Jews, and before taking offence it would be better if that person could first reflect on whether another interpretation might be more reasonable.

Seeking and finding offence where none is intended, especially where that offence is fairly obscure, as in this case, does nothing to help situations where the offence is real and needs to be stood up against.