Ronaldo for me, by a long way.
I knew back in 2008 that he was an egotistical, self absorbed prick when he did his best to take the edge off our CL win by making that summer all about himself and his "dream move", and that clubs, team mates etc meant nothing to him - his only love in the world was himself. Him agreeing with Blatter and his "slave" comments was absolutely appalling.
Without Fergie's fatherly influence, his ego ballooned out of control and reached stratospheric proportions. I always knew that he would become a major problem as he aged, as his body would eventually stop being able to keep up with the demands of his ego, and that he would be an absolute nightmare for whatever unfortunate club ended up being stuck with him in his twilight years. Of course it had to be us!
I kidded myself for a while into thinking he'd grown up when he returned in 2021, but was brought back to reality very quickly with his 2022 summer antics of whoring himself around to whoever wanted him (no one), his on pitch tantrums and walking out of the stadium against Spurs, and finally his repulsive Piers Morgan interview (although I must admit, he was right in calling out the Glazers).
Now he's just delusional with his nonsense talk about how the Saudi Arabian league is better than Ligue 1.
I'm just grateful he's not our problem anymore. Can't wait until he retires.
Other top contenders are Tevez (feck you and your R.I.P Fergie sign, then pleading ignorance that you didn't know what it said), Sancho, Di Maria, Lukaku and Pogba.