This is a real tough one because obviously groans and worse from the crowd will do more harm than good. On the other hand...
When we have the twin issues of sky high prices and players wages, I can't really blame people for being pissed off. Especially at players that have continually made game changing errors, but continue to get pay rises and / or contract extensions.
My admittedly simplistic view is that Liverpool pay high wages and always have done. Not necessarily the highest but higher than mid table clubs. Part of what is priced into those higher wages is the expectation that players have the mentality to play for a big club and can cope with the pressure that goes with it which includes playing in big games and more competitions. Playing 50 - 60 games, some with big stakes rather than playing 38 league games plus a couple in the domestic cups. Even in the recent past we've had players that have thrived in big games, evidenced by our record in finals and shoot outs. More recently we have turned into nearly men. Losing finals, shoot outs, leagues, leads. In fact any time there's pressure there's a chance of a Liverpool collapse and I think the lack of accountability that we've seen links to the frustration shown by the crowd at times.
If players, and staff aren't mentally capable of playing/ operating at the level we aspire to be at then they shouldn't be here. When we start to recruit better and mentally stronger players and get rid of the mediocre mentality that has been part of the club for the last few years, we may see less frustration from the terraces.