When you agree with it, it's an honest opinion. When you disagree with it, it's propaganda?
But given the number (and impact) of pro-IDF groups whose explicit goal is to control the online Israel-Palestine debate through propaganda, stuff like this is particularly tiring. Every time conflict breaks out a bunch of kids start spamming unrelated forums with their crap.
Edit: Note that I'm not claiming the other side is innocent of this behavior, it may just be that I notice the Israeli stuff more/hang out on forums more prone to being exposed to them.