You just need to look at the top posters in this thread to know that's a load of rubbish.
Then go and see who is posting in the Lindelof and Maguire threads to confirm it.
Smalling has a small but incredibly loud fan club who have only gotten louder since he left.
The vast majority of his 'fan club' simply state he is better than the rest of the defenders we have (Maguire is now our best overall defender, but Smalling is still our best defensively). I'm pretty sure even Ekeke has said that he has his weaknesses and if we made the right signings we could do better. It's just that getting those right signings are a lot harder than his 'haters' make out. The fact that we've spent close to £200m over the years on a bunch of different defenders and he should arguably still be in our starting 11 says it all.
I fully agree that there's only a small group who constantly defend a lot of the over-the-top criticism. But over the years there's been quite a few discussions about our defence as a whole, and the majority pretty much always end up agreeing that our strongest defence was Smalling + somebody else.
'Haters' - He's absolute shit, no better than Jones and Rojo (some say he's worse), Championship level defender, will give away regular penalties because of his grabbing in the box, gives the ball away constantly, is a big reason for our lack of attacking thrust as we can't play out from the back, etc. Hell, I've seen numerous people try to claim that he's slow.
'Fan club' - He's our best defender and has been for 5-6 years. Has given one penalty for grabbing in his entire career, and so far all the evidence shows that VAR will barely change that (I personally expect it'll increase very slightly, so maybe another three or so throughout the rest of his career). He's annoyingly weak on the ball, but he realises that and plays it safe so he rarely actually loses it. Could be improved and it's actually annoying that we haven't, but that's the reality of it so no point pretending it's not.
That's basically what it boils down to. Which one sounds more like it's being more realistic?