The vast majority of Employment Judges are, the vast majority of the time, calm and reasonable.
It’s useful, however, to have in mind, when preparing your case, an imaginary Judge, who is rather angry and doesn’t seem to know much employment law. Imagine that, at any given moment in your cross-examination or submissions he might break in to say ‘What on earth are you talking about, Mr Reed? This all seems like complete nonsense to me!’
Would you be able to convince this testy Judge that you’re right? Can you support your position with the necessary scaffolding of legislation and case-law? Can you explain why your line of questioning is relevant to an issue in the case? Because if not, you may be heading for trouble. If you can’t support your view, maybe you’re wrong. And, even if you’re not, exactly how are you going to persuade a Judge who has doubts?
(I think this is really advice for professional representatives, who might find it a useful mental exercise – if they haven’t already internalised the process. If you’re a litigant in person, imagining a Judge asking agressive questions may just make you stressed. If you’re worried about this, I’d suggest observing a few hearings and see how real, rather than imaginary, Judges behave.)