Not enough 2-way understanding in football these days between players and referees.
I would suggest that both players AND referees are guilty for this. Referees (especially inexperienced ones) are too zealous to display authority over players to the point that the most minor backchat results in sanctions, whereas players and managers seem desperate to find a scapegoat for why they are disappointed with their team's result and seem astounded that their arguments result in anything other than a referee agreeing with their uneducated and misinformed opinions.
My advice to younger referees would be to try and take a step back and use personality and character to manage difficult situations, which can help you co-inhabit the field of play with players. This will stand you in much better stead as you get more challenging and better-quality games where you will be dealing with the same players more often.
I will say that the issue with players and clubs taking issue with referees is a deeper problem within the culture of football and will perhaps never be fully extinct. A similar case was with Mark Hughes taking issue with Martin Atkinson over 2 red cards and his own dismissal despite all 3 punishments being fully deserved. Some people within football just seem to display a general ignorance towards a referee's duties and powers while on the field of play, and that is something we all have to contend with.