The conflict between safe space / security and highly-visible but effectively pointless gestures is ... significant.
I'll also note that I've known my admin for many years (across a few social networks, with many interactions), and generally highly regard her take and approach on matters. This is not a trivial question, though I feel she's come down on the wrong side.
Remember when Gab tried to join the fediverse? A bunch of instance owners got together and agreed to betray the entire premise of the fediverse by blacklisting Gab.
[bla bla bla, i don't support gab, and all other disclaimers]
However, Gab and the like are still there, and you're free to run your own instance and federate with them if you want. Maybe not Gab, last I heard they forked Mastodon and ripped out their federation code.