Relationship?

Sorry but I gotta get some input on my situation.....so I know my So's family doesn't like me they've made that very clear. I seen a post on social media that one of the family members had posted of my So and his ex (they have a child) so my problem is that I find it very disrespectful that they put that up I know they don't like me but do they have to do that? And I did tell my So about it I told him how they are disrespecting our relationship he hasn't replied to my text and Normally when we are home we never bring up the old conversations. Im thinking of calling it quits I can't deal with being disrespected when I have way more to concentrate on(my kids). So if anyone can please offer some advice am I making it a big problem? Should I let it go?

*hold the bad comments don't need them..