Does anyone have personal website pet peeves?

[Memory]

To play devil's advocate, HTTPS protects users from MITM attacks by bad actors looking to inject anything from obtrusive advertisements to literal malware into victims' web pages when they are served over plain HTTP. This has already happened on several different occasions, and it's not unreasonable to assume that, given the opportunity, bad actors will use code injection attacks as a means of extracting as much revenue as possible from their victims.

You're right with these things, but I think it would be more important to secure the browser itself. The root problem is the browser executing code (JavaScript, Flash, ActiveX for example). If code execution would be restricted or even prohibited completly in the first place, lots of those problems of unencrypted traffic become irrelevant. Intrusive ads should be destroyed on other fronts, if you ask me (filter lists and script blocking for example). Though I remember a man-in-the-middle attack, where website text was altered to give things a different meaning. That's evil indeed and hard to discover. However if the encryption certificate is compromised or decrypted (beware of superfast computers out there), it's rather a false sense of security that comes with the "S" of HTTPS. So no guarantees unfortuneatly.

[TheNothingMonster]

Oh man, my site falls under some of the categories mentioned here. I agree with a lot of points and I will consider everyone's opinions while working!

My sins:

1) JavaScript as Foundation: My site requires a browser with JavaScript enabled or otherwise it will not work at all. That is due to some "shortcuts" I have taken while coding. I would have used PHP instead if Neocities supported it.
2) Not Sharing Buttons: I am one of those who showcase their 88x31 buttons but have not linked anyone else back in return. That is because I have yet to make an "external links" page! I have gathered a lot of buttons from others and I really want to add them some time. ^^
3) Screen Adaptability: Thanks to my wonky CSS skill set, my site sometimes works on smaller screens and mobiles... and sometimes it doesn't.

My pet-peeves:

1) Autoplay: I also have an issue with autoplay, especially if there have not been any warnings prior and the sound is very loud and sudden. I get spooked!
2) Text Size: I refuse to read tiny text for my eyes' sake. :P
3) Pop-ups: While browser pop-ups might be informative, I find them quite annoying. I have come across instances where pop-ups were used as warnings on index/home pages, which were useful at first, but became a bit frustrating to deal with once you have to load/visit the page over and over again.
4) Dead Ends: Unfinished pages or links that get you into 404 pages, especially without an indicator. I do not have a problem in most scenarios, unless the entire site consists of non-existent, "Under Construction" or "Work In Progress" pages.

Stuff I do not mind that much:

1) Carrd-like Sites: It's their site. I cannot tell them what to do. Though, I have got to admit that it takes the fun out of web creation if the code is copy+pasted. If they made it themselves, sure! I don't care!
2) No Meat, Just Decoration: I do not mind seeing sites that are just aesthetic without much context to rely on. I think they are really beautiful in some cases. It is a different approach to most common personal sites. Again, they can do whatever they want with their site.

These are some subjects I could think about for now.