common, if you want to be technical, this is maris ayn about halacha of endangering someone’s lives. People will be thinking that you are not careful about human lives. When I walk on Shabbos, first person out of a shul without mask, I guess might get benefit of doubt that he has an ADA psak, but not the fifth!
More generally, the question is, as I quoted the class above: “If people see someone who learned Torah and they think his behavior did not become more refined or, worse, became worse. Then, they project these behaviors on Torah”.
So, IN CURRENT CIRCUMSTANCES, when people make assumptions about groups based on individual behaviors (see some idiots punching Chinese grandmothers) and already information about Jews non-complying, then surely looking Jewish and looking non-compliant is hillul Hashem.
I would be interested to hear why it is not a problem, according to your Rav, you or anyone else.
So, this person should take additional precautions both against virus and hillul Hashem –
travel less, isolate or test before travel, wear an ADA sign, wear a shield, apologize and explain to neighbors in the plane