When people cannot see you, and also do not know you, feelings can be hurt if you are not careful in how you express yourself. The old saying, think before you speak is important here. Think before you write. One word of advice is, do not respond when you feel angry. Wait. Write it down somewhere and come back to it. When you do, you may find that you no longer feel the same way as you did when you wrote it, because you have had time to reflect about the situation. Last, if you still feel the need to be heard, then edit before you post, and write it in terms that are easily embraced. This is also true when you feel a critique is necessary; say it in a positive tone. Reread what you have written to be sure it is positive.