Saying that "falling birth rates are due to the MeToo movement" is the same as "criticism of MeeToo" cheapens the word "criticism" and definitely dilutes impact of both document and what you say.

If in the same message you refer to movement that whose part were multiple real world lawsuits and at least temporary attempts to get some rights to situations with quite serious harassments as "hashtag-activism movement", then you cheapens even more words.