As much as I like Mitch, I have to agree with this.
If you can't handle the criticism of some, you should not expose yourself by writing so much material in your posts. Not everyone is going to agree with you. Some will systematically break down your posts in a tactful manner, others will directly attack you.
Think about it. Well-known journalists like Jason Whitlock, Stephen A. Smith, and Skip Bayless make millions off people who hate them so much, but the common trait amongst these opinionated journalists is instead of letting their detractors bother them personally, the take the opposition's vitriolic attacks as fuel to write more controversial, polarizing articles. Since you are the ASFN de facto opinionated columnist, and have been since I can remember, you should be used to this by now.
Clearly, you'll be missed when/if you decide to leave, but if you choose to post on other message boards, the contrarians will always follow. So you can choose to accept that people will not agree with you all of the time while sometimes being less than fruitful, or you can continue to let it bother you personally. For your sake, I hope you choose the former.
You can change the frame, but the picture will remain the same.