My daughter did not put up the blanket, that's not really the point. She was upset because she thought she'd done something wrong.
If I am to follow your logic, Who was the chanting directed at? Me? Then I take great offense at the initial chant. As do my relatives.
The second chant referred to sticking the flag up your ar$e, well I had no flag. My daughter did have a Liverpool blanket though. I wasn't even standing behind it, it was 4/5 seats down. My other family members were though.
You must also add to this the fact that I was abused after 90 mins, I was simply walking past, I did not ask to be chanted at, pointed at, sworn at and told I was a disgrace and a bad parent for bringing my kids to a match after their bedtime.