Gone through past seasons results against the top 6 mate going back to 2010/11 season. Here's the figures.
11/12 W5 D4 L3 Points 19
12/13 W3 D1 L8 Points 10
12/13 W2 D6 L4 Points 12
13/14 W4 D3 L5 Points 15
14/15 W1 D3 L8 Points 7
15/16 W1 D5 L6 Points 8
16/17 W2 D4 L6 Points 10
17/18 W0 D4 L8 Points 4
So yeah, apart from back in the Moyes knife to a gunfight days we've never come out on top against the top 6, and it's debatable how "top 6" Man City actually were in those days. But realistically, isn't that to be expected to a degree. We could never compete with the big boys on transfer fees and salaries.
But I have to say it has been worse this year than normal. It's the first season we haven't won a single game and, in fairness, haven't remotely looked likely to. We have basically been given a footballing lesson by the big teams this season evidenced by the for and against stat of 6 v 30.
I now you're not one for stats mate but these ones don't mask the truth.
And this isn't a go at Sam per se. Koeman was in charge for 5 of those games. It's just highlighting the fact that it has been a bit worse than usual this season.