Okay, well, what are your expectations for an (edit: public) online space? What makes blocking unreasonable people an unreasonable option for you?
To be clear, I'm not trying to lay the responsibility exclusively on users here. Trolls and agitators have been around as long as the Internet has. But moderators are volunteers and don't have the bandwidth to diligently police their spaces 100% of the time.
Reputation, whether informed by a voting system or not, has always been an important component of excluding bad behavior in pseudonymous communities. I don't think it is a reasonable expectation that you can participate in a space without spending any effort in keeping it clean for yourself and others (not that I think your position is necessarily that severe.) Reporting bad behavior should be the minimum expectation, and I see the block list as a fallback for when moderation efforts are insufficient or don't align well with the user's expectations.