Because they're fed shit articles like this, folk telling them how wonderful Ibrox and Parkhead are for atmosphere; It takes 2 teams to play a football match, both sets of fans should be able to enjoy the "atmosphere", not just the home fans. These journos will go along and only see it from the home fans perspective, to give a really true picture they should go incognito as an away fan, they would be writing a different article then.
https://www.thescottishsun.co.uk/sport/football/7731662/rangers-ibrox-uk-best-stadium-celtic-second/