He has hundreds of weird moments on camera where he behaves like he has zero social skills and behaves very weirdly.
Again, it's not his job so I don't blame him. But it is what it is.
He's probably autistic or on the spectrum. That doesn't make him less intelligent than Ronaldo, though.
Bad social skills and weird behaviour don't make one person less intelligent than another. In fact, you can argue that high sense of inhibition is overanalysing surroundings and being very tuned in to what others think. That doesn't mean Messi is smart, but some people with 'zero social skills and weird behaviour' probably act that way BECAUSE they are smart and constantly overanalysing. You are trying to claim it makes them less intelligent when actually you can argue the opposite.
It can also be lack of confidence, which is nothing to do with intellect.
Ronaldo on the other hand thinks in a very shallow manner and just says whatever comes into his empty head.