Bam Margera says he's disappointed his estranged wife and her attorney are bashing him in the media ... but he insists he's been supporting his son, and hopes to one day share his side of the story.
It appears Bam and Nikki Boyd's legal separation is already getting nasty ... with Bam going online to respond to her recent allegations of what led to her filing for the split.
instagram.com/p/Co_h5rluFyy
Bam posted a photo of Nikki, Phoenix and himself in happier times, and captioned it .