I don't find it remotely amusing.
I know too many women who have been in marriages like that to find that level of disrespect and shit behaviour at all funny.
It's just another example of how men treating women as second-class citizens is so acceptable as to be amusing - really?
And for you, OP - I don't know whether the relative thought it was funny because it was just like your marriage, or whether they thought it was a subtle way of telling you that they realise it's just like your marriage and you can talk to them if you need to - who could tell, just from receiving that?
Have you spoken to said relative? Because I would - try to find out their motivation, maybe.
And I assume the reason you're trying to go through official channels re. your husband is that you're unable to leave without assistance - but keep trying. Make your plans, get everything you need together and then tell him to fuck off.
In the meantime, look up "grey rock" technique - one of my friends has just got rid of her EA husband, after using grey rock to stop reacting to his abuse. She found it quite effective in managing her response to his abuse, but she also found that it confused him, because he wasn't getting his "fix" of pissing her off/upsetting her. Make no mistake, your husband enjoys winding you up/gaslighting you etc. - he gets a kind of kick out of it - so try to deny him that kick.
I hope you manage to get out of your situation soon, before he totally destroys your resistance.