I never once said anything about Robinson being soft compared to Shaq. I just said that tons of blocks, rebounds, and taking hard fouls have little-to-nothing to do with being mentally strong. In fact, I agree that it was ridiculous for people to bash on him, they way they did, much like I think it's ridiculous for people to bash on Dirk the way they do, even though by track history, I could understand why, despite it being unfair criticism.
However, I will say that I do believe Shaq was mentally tougher. He wouldn't let no one with him, thus giving him a mental edge on opponents. He intimidated people a lot more than Robinson did. That's part of the reason hes a greater center than Robinson was. Thats a big reason why he was so great, period. He had a very intimidating appearance and mentality. And everyone knew he wouldn't take crap, and if you tried to with him, he would make you pay dearly, typically with a couple monster dunks right over their head.