Actually, rather than having a go at the Freepers, the vast majority of whom, luckily, know very little about Scottish soccer nor life in the West of Scotland, you'd be better served to have a go at the journo who wrote the article.
The article itself is a one sided and inflammatory, (no explaination of why the gesture was regarded as offensive at an Old Firm match, no comment by anyone who isn't Catholic nor a Celtic supporter, no reference to complaints brough by Celtic supporters about Rangers players/fans doing similar).
The article was most likely designed to press the right buttons on those who don't know anything about sectarianism in the west of Scotland, which it did.
that is a very valid point....apologies