In most cases, questions and suggestions that contain the words "Why don't you", "You should", and "Is that all you know?", especially when it's based on a motive to change me. Isn't it bad enough that I have to worry about what I should do in academic, occupational, and public environments and situations? Why would I want to be around people like that on my spare time, especially when I'm not doing anything illegal or damaging to myself and other people? Just let me be who and what I am. I don't have to be like you. I should be able to be just fine with being myself, and not have to impress, entertain, or excite you. If you also find me boring, then so be it, and move on, and leave me alone. In that case, I'd definitely rather do things my own way, on my own terms.
And besides, if I'm so boring, why bother? You're doing yourself and I a favor by leaving me alone. Don't waste my time, and I won't waste your time, and if it was already wasted, it'll hopefully make you sure that I'm not the actual person for you to spend time with the next time you want to socialize.
It's actually just that simple to me. The same thing also goes if you were to find me negative and depressing. Why bother? Don't talk to me. Go away.
I also still hate teasing and nagging, as it also seems to go hand in hand with unsolicited advice. Only when it happens to me am I reminded as to why I should most likely never offer advice or suggestions to others, especially when they didn't ask me for it no matter how nice and supportive I'd intend to be, as I'd come across as trying to make the other person be something they're not, or come across as if I'm undermining and pressuring them. Being around people that always wanted to change me is also one of those greater instances where I'd prefer to be alone. I'm not saying that all change is bad either, but when it comes down to imposing, manipulating, or just being condescending, that's my limit, and my overall cue to leave, and allow myself to be alone.