I don't even know what to start with, but it's clear I've faced lots of dumb people during my life. When you first meet such person you don't really feel angry or pissed, but funny, because that person acts retarded. When it comes to the point when 95% of people you meet are being dumb - that becomes really sad. Not because you'll have to spend more time talking to such person, but because at some point you do realize that the world you live in is filled with dumbness. At the same very moment, the bright sparkle appears in your mind and you feel really thankful to the destiny that lead you into meeting your true friends (in case you and your friends are not retarded as well).
When your job or everyday routine collides with constant conversations with random people/clients you become being too easily annoyed. I had lots of real life examples, when people dumbness reached infinity, for instance, some of my really old clients complained about being scammed and rated because (guess what?) being unable to see the tray icon + windows notification. They definitely thought they ran a virus just because being blind. And for the first time I got triggered really hard. I had to spent an hour to explain what "Windows Task Bar" and "Windows Tray" is. After the moment that customer realized he was wrong all the way long he just said "Oh, sorry, I'm dumb" and went offline. Not to mention cases where my clients asked questions listed in quick message just a bit up in the chat history. That was the time I accepted payments manually via Skype/Telegram. I literally made a list of FAQ and when someone added me - I just pasted that list to them. It basically contained information like "Make sure to read website info, not asking dumb questions, not begging for free version, etc..." and 20% of my clients just kept asking me these questions listed above. That's when I started losing my patience and going full rage on those people.
Another thing I really loved is when some guy adds you, asks legitimate questions, asks for future discounts, OS compatibility and other questions people should ask before paying for any software product. Then he suddenly says something like "Ok, thanks, I'll add you back in a month and buy it because I'm broke now.". Not that retarded, but still a bit confusing, but another thing is when some guy adds you and as soon as you accept the request he says "Hi, I love your cheat and want to buy it! I'll add you back when I will have money!" and quickly unfriends you. Really? It's like you go to bread shop, ask the seller to get you some fresh piece of bread and then tell him "Oh man, I love that bread. Will get back when I have money.".
Sometimes I meet dumb people pretending to be not dumb and trying to outsmart you. One of my potential customers added me on Skype and told me he wants to buy 30 days subscription. After asking him if he completely understands the rules and stuff he proceeded to payment. Then I receive 15 rubles. 15. Rubles. Like... It's $0.15. After I told him "Nice joke m8" he tried to act like he doesn't understand what's going wrong. After sending him printscreen of the website label saying "All prices are in USD" he immediately changed his behavior and asked how much should he pay to get the subscription. My answer was straight and short: "$15". He went AFK for few minutes, then came back and told me to get ready to receive another payment. Then in few more minutes he asks me this: "Can you pls refund?". Refund what? 15 rubles which got consumed by the fee?
Absolutely another thing is when you meet kids under the age of 16-17, sometimes even 18. The point is that most of them are extremely self-confident and think they're "special". It makes all your attempts to rationally argue completely pointless, because they can't even understand you. All they say is "Fuck you, I'm the best". And apparently they can't hear anything except for such lexicon. So basically if somebody shittalks you and you try to talk back - they won't even understand the depth of your words. So, that's the conclusion I made for myself: never talk to dumb people and/or kids in attempt to prove/explain anything. Arguing with an idiot is like playing chess with a pigeon. They'll just knock over the pieces, shit all over the board, and then strut around like they've won.