The reason why Rudra chose to pick a fight here today with the envoy of Lucifer was because of two very calculated reasons.
1) He needed to showcase his abilities to the higher powers so that they gain some respect for him and try leave him and earth alone, even if it is for a short time
2) He might as well make his take on the dark faction crystal clear and announce to the universe that he is pro light and anti dark.
To achieve this goal he needed to bait his enemy into beleiving that he was wayy to impudent and needed to be taught a lesson in respect.
Raxa definitely had it upto his neck by this point, as his voice started to tremble with anger when he addressed Rudra, although he had instructions to not tangle with the earthling today, he was re-evaluating the situation.