Suddenly, about thirty of my answers were downvoted: https://japanese.stackexchange.com/users/458/sawa?tab=reputation.
It looks like it was done by a single user, given the fact that these consecutive downvotes were done right after the user gave replies to my comment, and also that this user was awarded the Critic badge (given for first down vote) as well as the Suffrage badge
(given for using 30 votes in a day) shortly after. (Very professional act as a teacher of English as Foreign Language in Osaka.)
I have already asked the moderator about this, but what is the best way to deal with this?