In fairness he's a serial diver which Dinho never was. Dinho also never complained on the pitch when being kicked to pieces by mere mortals. He'd often smile with the perpetrators as though he felt sorry for them. Personally don't care about any of this but I can see why it would irk some people.
Ronaldinho was made of granite when he actually trained and took football seriously. Easily one of the hardest creative players to dispossess because of his power, ability to centre his gravity and the fact he would use his athleticism as a springboard on those who got too tight, often using that touch-contact to roll his man and humiliate him in the same motion.
Opposition soon learned that getting touch-tight with Ronaldinho was a bad idea and stopped doing so pretty swiftly, so Ronaldinho really didn't have a hard time of it in terms of physicality and hacks relative to someone like Neymar who is so lightweight and frail, it's become a universal tactic to try and send him to the moon.
It's worked, too, as he's missed lots of key games at the most crucial points of tournaments because of it (not least the World Cup where he had his back broke!) so there is always incentive to nail him as the 'reward' has a high probability of happening.
Neymar's the frailest of all the skill players active by a huge margin - would be interesting reading to see how far out in front he is for injuries caused by other players as opposed to his own body breaking down.
I get that people don't like him, but objectively, the bias is clear and apparent. Neymar is one from a long, long line of skill/flair players who take great delight in displaying their brilliance at any opportunity they get, but for one so devastating and effective, and thus not a show pony, the criticism he gets is pretty absurd.
People should just say they don't like him, which is better than making up nonsense about the pitch and in-game actions.