It's never nice to be criticised but the great thing about keeping on writing and publishing is that, over time, we get used to the notion that while some people like what we do, others will be indifferent, and some just won't get it.
That our job is to keep on doing it anyway.
The only useful thing to do with a bad review (or a good one, for that matter) is to learn from it, if we can.
If we can't, to let it go.
To treat (with apologies to Mr Kipling) praise and put-downs, those two imposters, just the same.
This recent book review of one of my books should demonstrate why:
In fairness to the reader, I think this arose because Amazon is now emailing customers to ask their opinion of books they've purchased or downloaded. The customer is led to respond to the email on the book's page, where it comes up as a review.
But it also shows that the only sane standpoint on reviews, for a writer, is laughter.
Write on, dear indies!