Read the rules at some point before telling everyone to know about them
50/50 IS trolling.
We have a new champion on this board
I'm not telling that to everyone, I'm talking to you, because you called me a noob, meanwhile you seem to not understand some basic rules.
Kimpembe made his body bigger by not gluing his hands and that helped him to block the ball. (this is a rule)
Kimpembe did that on purpose ? We can't know at 100%. (this is a rule)
Almost the same thing happenned to Perisic during the World Cup final and to Otamendi against Schalke.
For those reasons I'm telling you it's 50/50, because you can give it or not and it's not a scandalous decision, your acting like it never happened before, get a clue.
As for Tagliafico, it was the right call.
The fact that you persist that Tagliafico did nothing wrong confirm my point and I'll suggest you again, to know your rules, before giving your opinion.
Was Tagliafico offside when the action started ? Yes (this is a rule)
Did he participate to the action ? Yes, he prevented Courtois from doing his job. (this is a rule)
Then it was the right call.
@Corto gave you a great and clear answer, he even added some photos.