'You're not going to sell me that crap.'
Read what you wrote. You said there is no pressure. So booing is pointless unless your aim is to make a fool of yourself.
What I wrote is that pressure
from afar (such as media and pundits) can't be considered a real pressure environment for the player.
Fans booing a player is a real pressure situation. Some can handle it, some can't. To play for Real Madrid you need to be able to take it and use it as motivation because that's how it is and it's not going to change.
Marcelo after the game on the whistles to Bale/Benzema:
"At the Bernabeu this is normal. It means the team should be doing better than they are."
Big boys can take it and they know that they better deliver the next game because if they don't it's not going to be a pleasant night with the fans.
For a player to succeed at Real Madrid, he need to earn everything again and again and again for as long as he's there. If a petulant child like Ronaldo can take it and live with it, then everyone else should be able to if they want to be a part of the club.
I'm not saying this is the right way or the only way, but it's a part of Spanish football culture and more importantly a way of the most successful club in world football, so having others question it will not go well with Madrid fans.