Someone with an identity crisis?
When you choose to engage in an activity (in this case a discussion), you implicitly agree to conduct yourself with behavior appropriate for that environment. It's simply how social functions work. When you put yourself into the discussion you open yourself up to whatever scrutiny may follow for your comments or behavior, much as I'm doing now. If you have pre-existing personal baggage that could compromise your ability to conduct yourself reasonably, you have to weigh whether or not participation is worth the potential criticism that may well follow.
It's not compulsory to have your opinion out there in every discussion, and if you're in a position where voicing your opinion may do more harm than good, that's a choice you have to make. I've been here since day one, and I have less than 1500 posts. I average something close to one post every three days. Others have far fewer than that. There are quite a lot of times that I don't think there's anything beneficial I can contribute to a discussion. So I don't. Whether that's due to a lack of information on the subject matter, a lack of desire to talk about that topic, or occasionally just because due to my own real-life issues I don't think I could communicate my point clearly and effectively that day.
I'm only posting now because, for however much my own personal baggage may be weighing on me at the current moment (here's a hint: a lot), I think it's worth my time and energy to tell you the things I'm currently saying. As harsh as others criticisms may be, they're saying these things because to them it's worth their time to say it, be it to try to inform you or even just for their own personal catharsis.
I've brought this up once before elsewhere, but to close: During a stand-up routine a couple of years ago, Craig Ferguson brought up three questions you should ask yourself before jumping into a discussion. I think they're a very, very good standard with which to weigh the merits of a potential post, so long as you're honest with yourself:
Does this need to be said?
Does this need to be said
by me?
Does this need to be said
by me, now?