It may seem like semantics but it helps to not reuse terminologies that support or make a foundation for the ideology being pushed. Anti-mask, this by nature suggests that the mask, wearing one, and what it is worn for is already established as a belonging event or placement. Furthermore creating division of one side or the other with no alternatives. Against or for the event.

A correlation here, although ridiculous, is having rice as a base for spaghetti, and anyone not using rice in their spaghetti would be coined anti-rice. Where all the while rice did not belong since it is not a basis for spaghetti.