They sure seem very interested in her Arizona tea.

Someone on Twitter explained the image:

everyone except Bochi is packing, the cans are based on the one Alstolfo cosplay picture from a few years ago where the cosplayer was also packing... monster can was used for size comparison

So the 3boys/1other are looking at Bocchi's larger can and drawing the wrong conclusion from it, which is disturbing Bocchi.

I mean there are alot of bocchi doujins featuring something of that size

There's a voice over meme in Japanese that Bocchi's got a big dick
https://twitter.com/rituakaPAKOPAKO/status/1590670781117530112