Bam Margera recently expressed outrage over his estranged wife bashing him -- but she has every reason to after the difficult state of affairs he's left her in ... so says her lawyer.
Nikki Boyd's attorney, David Glass, tells TMZ ... "Unfortunately, Mr. Margera doesn’t seem to understand what ‘supporting your wife and child’ means" -- this in response to Bam saying last week that he was "disappointed" in what she and Glass had said about him publicly.
Glass adds, "Nikki has no car, no money, is being evicted from her apartment, and can’t afford to send their child to school, while Bam drops $50,000 on bail, and who knows how much on a Las Vegas spree.