I have just read the previous thread, you got some reasonable advice and views on there in my opinion, I didn't view any of the responses as bullying but you can report any comment to MNHQ if you feel they are.
I recall another of your threads regards the school mothers writing support to your ex.
Can I ask what the court proceedings are for? I understand that your Ex is the resident parent and you have access? are you not happy with the amount of access that you have or are you going for residency?
Is your DS happy with living with your Ex? is he happy with the amount of contact that he has with you currently? Is he thriving and doing well in school? because really that is all that matters isn't it?
Your DS needs to know that both you and his father love him very much and want the best for him.
Mummyoflittledragon has given you some great advice.
drop the everyone hates me attitude, your ex is your ex, he clearly doesn't like you so that's to be expected, just make sure that this doesn't spill over into your relationship with the person that matters, your DS.