Thank you for your message, I'm happy that you took the time to contact me.
I feel I must explain that no matter who you are lol, plz, k?thx, j/k and :) (or variations thereof) aren't going to cover up the fact that you're a jerk and they don't make up for it. These symbols and random letters do not an apology make and they don't make your rudeness disappear.
Please stop using these shortcuts and just say what you really mean. If you are too lazy to do your job and want me to do it, if you are asking me because you think I'm a pushover then stop it. I don't mind doing you a favour, I'm a nice person, but if you're trying to take advantage of me I'll see right through it. If you are mad at me then tell me why straightforwardly and honestly. If I have done you wrong I will do my best to make up for it without the use of a semi-colon and a bracket.
If you are angry or upset or happy or joyous about something please don't belittle your feelings with abreviations.