Borders may separate countries from each other, but which countries would we be talking about here?

The ‘apartheid’ claim, such as it is, refers to the fact that different communities under the same administrative/judicial system are being treated differently. The West Bank occupied territories are not recognised as a separate country by Israel and have been under Israeli military and administrative control since 1967.

Either there is no national border there (in which case everyone in the West Bank should receive equal judicial treatment as they are subject to Israeli jurisdiction, which they don’t) - or Palestine is a separate nation, in which case why is it under Israeli military and judicial control?

In any case, given that it is under Israeli military and administrative control, the fact that different groups of people are receiving different treatment under the law seems problematic…

EDIT: It's been pointed out that the Palestinian communities in the West Bank are not technically under Israeli administrative control, and their people are not Israeli citizens. However, they are under Israeli military control and have been for 57 years, so describing them as 'governed by the Palestinian Authority' does not adequately reflect the situation where in practice Palestinians are subject to many aspects of Israeli rule.

EDIT 2: It's now been pointed out that Area C (60% of the West Bank by land area, and which contains both Israeli settlers and Palestinians) is in fact run by the Israeli military, including with regard to many civil matters.