Ewan Murray again...
"It had seemed inevitable that Lafferty would play a key role in proceedings. This marked the Northern Irishman’s first appearance since the serving of a 10-game ban for a sectarian comment delivered in a nightclub. It represents the irony of ironies, of course, that the Celtic support who berated Lafferty here did so with sectarian language of their own. It is also puzzling that such garbage from the stands week upon week goes without punishment from the very same authorities who brought Lafferty to task. Scottish football does a fine job of pretending to be interested in offensive behaviour."
https://www.theguardian.com/football/2023/jan/14/celtic-kilmarnock-scottish-league-cup-semi-final-match-report