When you make a sarcastic comment, we can't see the concern on your face if you only say a couple of words, and we can't read your mind and fill in the gaps if you abbreviate your comments. Use emoticons for fun once in awhile. Remember there's a person on the other side. Ask for feedback if you're not sure how your ideas and comments will be taken. If you disagree with what someone has said, practice all your communication skills as you express that disagreement.
Derogatory comments are inappropriate.
Any derogatory or inappropriate comments regarding race, gender, age, religion, sexual orientation, are unacceptable and subject to the same disciplinary action that they would receive if they occurred in the physical classroom. If you have concerns about something that has been said, please let your instructor know. Plagiarism, cheating, and other violations are inappropriate. Plagiarism, cheating, and other violations of ethical student behavior are serious actions in a learning community. You should expect to be treated accordingly.