It’s awkward and it’s unclear to me why the author thinks he’ll take some flak. As the sentence stands, the author is expecting to take some flak because he’s taking a risk. Is it risky for him to post anything at all because he’s generally disliked, for example? Or is his opinion about one topic so controversial that it’s likely to get flak? Or is the topic so controversial that any post from anyone is likely to get flak?