No, this was anti-Semitic regardless of the target, just as misogynistic insults hurled at me remain misogynistic (I identify as male). For that matter, there are plenty of people who consider accepting abuse on the internet to be passé. Maybe trolls do want people to get mad, and this counts as "feeding them," but trying to shine a light on the problem at least has the potential to make it clear those who have been bullied into submission that somebody cares. Being silent and ceding ground in the name of Don't Feed the Trolls normalizes these people's destructive behavior.