Never doubt your ability to be influenced by propaganda. The technique that broke the internet in 2015, lying and then confirming the lie more convincingly with a second account, is still very successful today.
Largely because Reddit was so much more diverse. Even ol hive mindey Reddit tolerated differing views significantly better than the shit heap that is Lemmy.
Reddit does get super echo chamber-y in some places, though. Check out any thread in /r/worldnews lately and all the comments. They're all of the same opinion. At least on Lemmy I see disagreement. I see as many complaints about tankies on Lemmy as I do tankies themselves, for example. The only one I've seen in this thread has all their comments in the negative.