Thats pretty ordinary. A bit of banter is all in good fun, but this goes a bit far.
I will just add that I've had plenty of positive experiences with Doggies fans over the years and a few scary ones. Getting out of Belmore in 97 after the 5th place playoff was interesting, to slipping over and KOing myself getting in the car when it was pissing down at Homebush, had a few big Doggies boys help me up and hang about making sure I was ok and got in the car safely. There is good and bad in most crowds.