Red_Panda I see, thank you for the clarification. It's just the way you named the thread as well as the initial wording in your post, it kinda gave an impression you're venting rather than seeking an actual answer, at least to me it did. There's just a number of threads like this all across PA socials where people are in disbelief/suspicion of the other players' abilities when the latter are legit and are not doing anything superhuman. I only responded to yours because you actually asked a question. 😅
I'm talking about how you can fight and spam stickers endlessly in chat at the same time?
The general TL;DR answer is playtime / experience + muscle memory.
Can't say anything regarding the controller layout, but I play on Keyboard/Mouse and it's pretty easy to do that. Does not interrupt current active action and takes like a second. It's just a press of a hotkey and moving your mouse, don't have to be neither a pro, nor a hacker. The more you play/use this system, muscle memory develops accordingly, and it only becomes easier later on.
There might be macros for flinging though (rather simple to do given modern programmable devices and its tools). But again, that's different story.
Dunno how much of a help it is, but here's a vid where emoji stuff is done seamlessly during climbing: