> Calling someone who risk his life, saving children a paedophile because he felt he was insulted or attacked may have been perfectly acceptable in the land of freedom, but definitely not in UK.

Not acceptable here, either. It's legal, but it's socially unacceptable. Now, if Musk goes beyond name calling and makes an actual effort to paint the guy as a pedo then, I think, it's illegal. (I think)