[Fuzzwah]

Irrational probably.

Possibly I can trace this back to the fact that the 1st people to start using them were mostly douche bags.....

Maybe there's something deeper about having no respect for someone who considers themselves so busy that they can't find a place to stand and have a conversation. At least if I have to over hear a bit of their tedious phone call I do it as I pass them. Rather than walking behind / in front of them for the entire conversation.

I've never really invested a lot of time in thinking about "why" I dislike it. It is just an immediate reaction.

ps: I have the same sort of reaction to people who engage in long and useless phone conversations on public transport.