> Isn't being offended a bad thing?
No. Offense is a (complex) emotional signal that you may not be able to ally with someone because their worldview differs from yours in a way that your goals are likely to come into conflict. It's no more bad to be offended than it's bad to be angry, or sad, or happy; it's an emotional signal, one that binds to a complex sociological model.
> Doesn't it make sense to try as hard as possible to not get offended, to wait as long as possible, to give every benefit of the doubt, before being offended?
Maybe. Maybe not. It depends on the degree of the offense, the likelihood of adjustment of either party into a configuration where the offense is mitigated (very low for random internet interactions), and (here's the key) the potential upside of further interaction with the other party. For an Internet rando commenting on the feed of someone they don't know, the possible upside to that someone is low.
As much as we like to, each of us, think of ourselves as insightful luminaries and Renaissance men and women of the new era, spreading truth and novel insight and peering with the greatest minds of our generation on the egalitarian footing of social media... folks like Julia get to see dozens of folks parroting the same talking points as the ones she banned daily. If she's not planning to argue that point (and she has plenty of experience with the point to make that decision), it's fine to just toss a "The odds of any interaction we will have in the future producing value for either of us are near zero" ban on the account and go on with her day. Maybe some day she'll discover she banned someone who turns out to be fun to know in another social setting and she'll unban them. But the odds are near zero.
> We should encourage others (and ourselves) to take the least offense possible.
Why? What's the upside in a world of more than eight billion people in a context as casual as Mastodon posts?
I present to you a counter-model: maybe people should learn to do a lot more reading and a lot less posting. "Reading the room" is a more complicated skill when the room is virtual and varies from feed to feed in something as diverse as Mastodon... But it never stopped being a useful skill.