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But I was still taken aback, especially when shortly afterward supporters were singing for Conor Bradley, the guy who was substituted for Alexander-Arnold and who could inherit his right-back position long-term.
Most players will know what it's like to be part of an underperforming team that gets booed by their own fans, but to boo individuals: that's tough.
How often are fans happy to see one of their best players leave for another club, at the peak of their powers?
If it was a long-serving player at your club in this situation, what would feel right for you and those fans around you to do?
It will be interesting to see what happens at his final game on Sunday, against FA Cup winners Crystal Palace.
Now, Alexander-Arnold will go out in front of The Kop as a Liverpool player one final time, in no doubt how some fans feel about him leaving.
Some are unhappy with the fact that it feels like he's run his contract down to where the club couldn't get a transfer fee for him to go to Madrid.
He's not going to be the first player to leave the club for LaLiga, but he's probably one of the most significant players to go on a free transfer when the team's top of the tree and he's heading toward the best years of his career.
That's why I think there's some issue with some Liverpool fans; when you consider somebody to be "one of your own," then it's a big surprise when that person all of a sudden ends up leaving, and without that club getting a real benefit from it.
One thing that remains constant is the respect that he has from his Liverpool teammates.