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That's an acceptable trade-off for me.
You've put unicode into your username, and that's fine. But messages are very aggressively sanitized, the input scrubbed. That's a security thing to deal with some of the OWASP Top 10 security risks. If I disable that piece of scrubbing, even in one small place, it would create a security risk.
I won't do that... so instead, I'll accept that you don't get notifications and someone else does. Oh well.
Something extremely tiny I've just noticed:
https://www.lfgss.com/comments/12669528/
cjr @-ed me and I quoted his text that included my username. In the quote, the non-breaking space that I have in my username was evidently converted into a normal space, resulting in a wrong alert to an inactive account with one post.