I wonder if the threat displays would be universally recognisable across all the species from different planets. I think not.
Still a funny picture, I hope that appendage isn't a dick, that would be doubly rude.

Surely not all, but exposing the jaws is pretty common. Hence, poke the sensory organs to get samples. For Science.
Well, with dolphins using their genitalia for manipulatory purposes an spiders having secondary male genitalia on a pair of limbs mostly used for manipulation, I won't exclude aliens having their grasping organs being dicks. Which reminds me, birrins have their junk on their hands.

I might be ultra slow, but now it looks to me as a Serkanian version of the "please do not the cat" meme xD

PFF, pretty much.

it would be much worse if he reacted this way to the proximity of the Wi Fi router

Disagreed, it would be hilarious.

I mean it's one way to get an otherwise nonplussed individual to show some sort of reaction.

Even if the reaction is a foot in the face.

All in the name of science, of course.