Well, when it comes to conflating, I'll take your calling Israel a terror state as a standard: The democratically elected government of Gaza-Palestine is the Hamas, which is a terrorist organisation. Thus by your conflation regarding Israel to be a terror state, the Gaza strip part of Palestine is as well. Its population chose a known terrorist organisation, everything is run by a terrorist organisation, they did terrorist things such as bombings, abductions and murders of innocent civilians. Thus (Gaza-)Palestine is therefore a terror state. Supporting it is therefore supporting terrorism.
Thus either you apply your conflating standard equally, Palestine and Israel are both terror states, and any support of them is supporting terrorism. Or you rather differentiate, and separate Palestine as an abstract concept of a hypothetical future homestead of the Palestinians from the Hamas, the Fatah and other (mostly terrorist) organisations that govern it, and the population that, in parts, is governed by them and elects and supports or opposes them and their actions. But if you do that, you will also have to differentiate between Israel as a state, its military, government, parties, population and their respective support and actions.
In that second case you can support Palestine as an abstract idea without supporting terrorism, you can support the population and their rights, hopes and struggle. As you can do with Israel and their people. However, on pro-Palestine protests, I've never really seen this kind of differentiation applied, I've seen far too many Hamas flags, heard far too many calls to wipe Israel from the map, far too many praises for terrorists (called "martyrs"). Thus, in practically all cases, I'd without hesitation call supporters of Palestine supporters of terrorism.