Or just dont let away fans into the City end. Simples, no trouble. The guy shouting at them is achieving what we all want and that is to avoid future trouble. Just dont let them in is the fix.
Or say nothing, and depending on if the lfc fans are nice and polite we let them stay, listen to their jeers, cheers, clapping VAR decisions against us, hacking tackles on our players... might not happen but ffs if I see that I would probably act like that guy in the video to my embarrasment I suppose, but dont let them.