I have a slightly different take on it.We do not know what happened but despite Aurier not tracking Mane, lloris or Dier should have dealt with it. Now if Aurier is always called out for mistakes, are Lloris and Dier called out as well. If not then Aurier getting annoyed is more understandable. I consider all 3 partly at fault but if any one is mostly to blame it is Lloris who should be in charge of the goal area. Lloris should either say Mine or clear it to Dier or words to that effect. They have played together for long enough for communication to be better. I do not agree with the commentator that suggested he would lose a tooth as if Lloris verbally claimed it Dier would back off and Firmino was behind Dier.
Yes, all 3 are to blame and Lloris should have done better and commanded the 6 yard box, but................
If Lloris didn't call for it (and I don't believe he did) then Dier HAS to take responsibility.
If he doesn't hear a shout from Lloris calling for it, then he should put his foot through it,
If he doesn't hear a shout of any kind, he should put his foot through it.
If he hears a shout of "away" then he should put his foot through it.
Obviously the communication, from Lloris, wasn't there, but that doesn't absolve Dier from taking some responsibility and action.