If there were plenty, I’m sure a Twitter trans activist would have collated them in a collage similar to the one I’ve posted above, because there is no way they would let such threats go without being used as valuable evidence of the “hate” she apparently generates. Don’t you think it’s funny that no such page exists from JKR supporters’ tweets?
There isn’t even one person in conflict to JKR to say that her supporters have been abusing someone in some way. An entire faction of Twitter has aimed their vitriol at one woman. And you’re saying there’s an equivalent? Even if you find one tweet from one person who purports to support JKR that is abusive towards one person who purports to oppose JKR’s views, there is no possible way that equates to “plenty from both sides”.
What has happened to JKR in terms of orchestrated abuse is a violent form of extremism, designed to terrorise one single individual. There is not remote anything in the same league as that coming from the “other” side.