Agreed - I find it uncomfortable that people brand situations like this conclusively racist without any real proof. It's often anecdotal "evidence" based on correlation rather than causation.
The correlation for example between black players being referred to as "big and strong". Calling Pogba "big and strong" is factually accurate, the same is often applied to Andy Carroll. If the proportion of black players referred to as "big and strong" is greater than that of white players then that is only one facet of a two part test being fulfilled. The next facet is to determine whether or not a greater proportion of players who fall into that category are in fact black. If I look at United's squad then possibly Pogba, Bailly and Lukaku would absolutely fit into this category, as would Matic and Fellaini. If I were to think about the regularity with which commentators tag these players as "big and strong" I'd say Fellaini and Lukaku get it the most... This is down to strength and power being the stand-out facet of their games.
This is true also in my opinion when talking about footballing intelligence. The likes of Sancho for example get plaudits throughout the world due to his intelligence. On the flip side as you suggest Kante is never going to get the same level of praise, simply because that isn't the standout facet of his game. Kante is likely to be called tenacious or praised for his stamina.
In terms of these two articles... One of them says Adarabioyo bought a £2.25m mansion for himself, the other said Foden bought a £2m home for his mum. Any player of any descent is always going to get favourable coverage when buying a house for their mother, as this is something UK culture would applaud. Compare that with a 20 year old buying something ostentatious for themselves before society would see them as earning it and the coverage is obvious.
Look at the coverage for the Anthony Joshua as a comparison and it's far closer to Foden: "Anthony Joshua is the humble heavyweight...still lives at home with his mum in a council house" , "Anthony Joshua surprises mum with a brand new £80,000 Range Rover". Again it's nothing to do with race or colour and everything to do with optics. Tattooing a machine gun on your leg is horrendous optics, forcing a move to a rival club after protracted contract negotiations, at a very young age... Bad optics. Buying you mum a house... Great optics. Living with your mum despite being worth millions... Great optics. Sterling is targeted because his actions in the past have been objectively stupid or crass, as is the case with Adarabioyo. Joshua is a media darling, as is Foden because his actions have great optics. If Sterling wants to be treated better by the media then he should start taking far better advice
We should absolutely call out any racist overtones or undertones wherever we see them, but in my view simplistic and anecdotal non-proof such as Sterling's only serves to fuel racial tensions... It's absolutely not the way in which to address these problems. It's also unfortunate as instead of talking about a horrendous incident involving clear and disgraceful racism we're talking about the non-issue of two Daily Mail articles.