Reddit, at least, seems to be (rightfully or not) dominated by a strongly anti-Israel narrative.
Even the "great" BBC is not willing to call a spade a spade.
I decided to never look at those subreddits ever again.
I'm sure it depends on what subredits you look at. The moderators are essentially free to enforce their politics.
It's not quite based on nothing: there is footage of Hamas (or maybe Islamic Jihad?) digging up pipes to use for rockets and a Guardian article saying that Hamas could use the EU-financed pipes to make rockets, but as far as I can tell there isn't any evidence that the pipes Hamas are using are from critical in-use infrastructure.
One reddit commenter posted that the video of the pipe being dug up was to supply an abandoned Israeli settlement. Israel shut that water off a long time ago. I can't verify that's correct, but it sounds plausible.