Try to retain your good humour.
Litigation is stressful for most people and bad tempered advocates raise the stakes and make life more tiring for all concerned. All Judges (in the Employment Tribunal or elsewhere) dislike advocates who are quarrelsome and engage in petty spats during the hearing. We all know issues regarding disclosure or late exchange of witness statements etc etc can be really annoying but try to keep it professional.
If the point is serious enough, make the appropriate application. If not, move on. Don’t lose your temper.