Lemmy is even worse than than Reddit when it comes to sharing a different opinion.
No, it’s better in at least one way, at least for now. On Lemmy, there’s no such thing as ban evasion. If you hurt a mod’s feelings on Lemmy, you might get banned from your current account. But you can make a new account (possibly on the very same instance, but at least on another), and go on, hopefully with more strategically thought out commenting.
On Reddit, if you get a strong enough ban from a sub, it follows you everywhere. Their ban evasion algorithms are pretty good. For instance, I got a ban from r/libertarian (imagine that, yea? I think I criticized a pro-Trump article or something a bit too harshly). I try sometimes to get back there with new accounts, from new IP addresses and new email addresses, but the system detects me every time. Perhaps some fingerprinting that I’m too dumb or unmotivated to properly evade.
On Lemmy, most you get is people bitching at you and downvotes. You can block the people and you can hide the scores.