Ah ha... I... actually knew someone in an art group I was in that would kinda of do this... except she would just talk about her 'not yet made comic' vocally instead of dropping links. It was absolutely horrible... and made people NOT want to talk to her, she would even just throw herself and include herself in conversations.
Artist 1: Hey, who wants to get pizza after the meeting?
Artist 2: I can't go unless someone covers for me, I can pay ya back next meeting.
Artist 3: Sure I can do that.
Her: HEY THIS REMINDS ME OF A SCENE IN MY COMIC WHERE MY CHARACTERS GO OUT FOR PIZZA!!! It was really funny hahaha, I have to tell you about it, you'll love it!!
Artist 2: Maybe another time...
Artist 1: So, is anyone allergic to anything? Or there a topping someone doesn't like? I just wanna try and get one big pizza for us because it would be cheaper. Or maybe two medium or something?
Her: I'm not allergic to anything BUT I HAVE A CHARACTER in my COMIC that is lactose intolerant. So if he was here, we would have to get a lactose free pizza because he couldn't have a normal one!
Artist 3: Yeah... great... that's nice. But your not lactose intolerant right?
Her: No I'm fine, just my character. He can't have cheese and milk. I also have another character who is allergic to cats, but she's in love with a boy that can actually turn into a cat!
Artist 1: Ok so-
Her: So like, she runs into this boy at school and thinks he's totally cute, but for some reason she keeps sneezing around him and-
Artist 2: Umm.... maybe you can tell us this later?
Her: It's funny, I have to tell you while it's still on my mind.
Thinking back that group REALLY, had some tolerant and nice people in it holy shit...
That aside, yeah I can see where you're coming from, it's really odd when people drop link to their comics in almost EVERY post they respond in. When it's threads relevant then yeah that's cool, cause it's cool to see comics related to the topic, but stuff like you mentioned like "What toppings do people like on their pizza" getting a response like "I like pepperoni pizza, my comic takes place in ancient japan though so pizza doesn't existed for my character in my comic but if it did he would like pepperoni too! / Link /" It's not really annoying, just funny in a try hard way, and also makes me laugh cause every time I see something like that it reminds me of her.