LL, I think there are probably two different things going on here. One is that you post way more than is really necessary or helpful. You come off as needy and using the forum to avoid loneliness. People can sometimes find this irritating and it will cause them to be brusque.
The second thing is that in social circumstances where you don't know everybody well, and people tease you, it is inappropriate to react in kind or retaliate. To retaliate shows social weakness and immaturity and it is likely to result in people piling on. When people were telling you to get a thicker skin the other day it was with your own best interest in mind. Your retaliating will not change the nature of the forum but will only make you look like a bad guy. Teasing is dished out as an opportunity to show whether you are able to be social or not and you have been failing at this test.
I will also say that this kind of extended back-and-forth did not occur nearly as much before you joined so I would hope that you would take this as an opportunity to do some self-evaluation. I'm not saying that you are not justified in whatever you say but that you are hurting your esteem within the forums by acting the way you are. It isn't a matter of justice or fairness.