AIBU to think this was just childish?

[Hegsy]

Office of 6 people, 3 in from 8.15ish so all have a first cuppa then, 1 in at half 8(but she doesn't drink tea/coffee) 2 guys in at 9 normally one of the 9am guys makes tea when he comes in and we all have a second cup.

There have been some office issues of late but we all still do the polite thing and offer everyone tea/coffee when we make one, until this morning, 9am guy only makes him and other 9am guy his tea and doesn't offer anyone else.

AIBU to think this is just utterly childish? I mean really? He's thirty fucking four! Though he does still go in huffs when he decides he's been 'upset'

Ok I know this is petty but still.......

Attenborough

I hate these 'brew rounds'. I hate people making me drinks with incorrect quantities of milk/coffee/tea. I'm a perfectionist anal

Same here. I never let people make me coffee, I'm a fussy so and so and would rather just make my own.

It always used to make me laugh how you could tell, who had fallen out with who, who had a problem with who, by the tea rounds

I don't get it really.
You don't offer him a cup-albeit because he's not there, and he hasn't offered you one.
I wouldn't have thought you needed one at 9am if you'd had one at 8:15/8:30 and it is much more hassle to make 6 cups than 2.