I don’t know if they’re wrong (unless they’re saying you shouldn’t), but you’re absolutely right to. A guy I work with was out a couple weeks ago for Covid again, and my mom’s still suffering some long Covid effects.
Honestly at this point I’m sort of wondering why masking hasn’t been a general thing during cold and flu season. Or at least even if it never gets common, it should be not entirely uncommon. But I’ve seen a few people masking in public and my only thought is “I guess they’re being careful”