Aye, all right, so he insulted the fine name of roleplaying and it managed to make everyone angry.
He still has a point, and that point is common courtesy. Local shows up on everyone's lower window in a default setup, and that window gets a person's focus quite easily. If a random someone comes along and fills that window full of repetitive commentary, that isn't necessarily a nice thing.
So sure, be mindful that everyone plays different, and that its easy enough to ignore someone who bothers ye, but the lesson YE should take away from it is to always consider your audience, and situation. Spamming local with repetitive phrases next to a trainer for instance, whilst people nearby look for a group, or are greeting each other (in RP style or not) is not a nice thing to do, in character or otherwise.