So because he has a "track record" of founding companies that achieved impressive feats he it's now forbidden to call out his ideas as foolish?
I dislike this sort of miscasting of what I just said. I'm a very strong proponent of free speech and the right of anyone to say anything. But with my support for free speech comes a commitment to try to be considered and careful in what I personally say and I'm encouraging others to do the same in this particular context. You can take it or leave it and of course you can go on calling him foolish if you like. Musk doesn't probably care a whole lot and in the end, I would say that the negativity simply reflects back on you.