Immediate thought that comes to mind is that you can follow the Lemmy and Pixelfed accounts from your Mastodon, which would give you some ease in accessing their posts via Mastodon, and then boost the posts from there.
Hope that helps a bit, tbf cross-platform interactions like this are something I have very limited experience with.
Look, if he just left it at saying that the protests were fine but the encampment was not, that would at least be understandable.
COMPARING IT TO THE FREEDOM CONVOY? BRUH